Mónica’s talk focused on the treatment of five oil paintings on meta at the National Center for Conservation and Restoration (Centro Nacional de Conservación y Restauración, or CNCR) in Santiago, Chile.
In 2012 five paintings from the Bernardo O’Higgins House Museum in Talca, Chile were brought to the CNCR in serious need of treatment. The paintings represented an exciting moment for the CNCR, since paintings on metal had not been treated there previously. One of the paintings was signed by Willem Van Herp, 1655, making it the oldest painting to be treated at the CNCR. All five of the paintings were bought in Europe in the 19th century by Eusebio Lillo (who also happens to have been the author of the Chilean national anthem) who donated his large collection of art to the museum upon his death in 1911.
Of the five paintings treated by the center, three were 21 x 29 inches, and two were much smaller, measuring 9 x 7 inches. Two had been previously cradled, and the rest were otherwise unrestrained. Four of the paintings were on copper, and one was painted on tin-plated iron. Various condition issues, all common with paintings on metal, were present; the most serious issues were corrosion (which consisted of brown stains and corrosion products protruding from the paint layer), distortion of the support, flaking paint, discolored varnish, and puncture holes where the paintings had been nailed to walls or altars. In addition, large areas of overpaint were present.
Treatment of the paintings began with documentation and an initial analysis of the imagery depicted. All of them appeared to be allegorical or religious, and a few were clearly similar in composition and subject to other, more famous paintings, such as the painting referred to as “Disciples of Emmaus” by the center, which featured two parrots that were exact matches to those in a Jan Breughel painting from c. 1620.
Cross sections of the paintings were taken in order to help conservators to distinguish between original and later paint. The four paintings on copper were found to have a lead white ground, and the painting on tin-plated iron had a ground consisting of Prussian blue and lead white. Varnishes were found to be mastic or dammar, but were clearly not original for several of the paintings. UV examination revealed aggressive cleaning and intervention in the past.
In order to determine the best methods for treatment, copper prototypes were created and used to test adhesion of various adhesives. The CNCR used Isabel Horovitz’s research into paintings on copper as the primary resource for their work. Following testing on the prototypes, corrosion was mechanically removed, and a solution of 15% B-72 in toluene was used to isolate the corroded areas and to consolidate flaking paint.
Distortions in the support were significant on a few of the paintings, and conservators hoped to be able to reduce it. Flattening was attempted on prototypes using a book press, and the result was considered to be less distracting. A few of the paintings were flattened in this manner. An acrylic plate was applied to the reverse to provide support and to allow the reverse of the metal plates to be seen.
15% B-72 in toluene was used as a base for filling losses in the paint surface, and a tacking iron was used to level the edges of the fills. Fills were isolated with a varnish and inpainted to a full visual reintegration. After cleaning and inpainting, the subjects of the paintings were revealed to be religious and not allegorical. The center has suggested re-naming the paintings accordingly, and has sent their proposed titles to the O’Higgins museum. The treatments and the revealed subjects will be summarized in an upcoming book.
Category: Specialties
42nd Annual Meeting- Book and Paper Session, May 29, 2014, "Preserving the African American Scrapbook Collection of Emory University Libraries by Ann Frellsen, Kim Norman, Brian Methot"
This three-year Save America’s Treasures project was presented in a three person tag-team. The project represented a collaboration between the Emory University Libraries Preservation Office, Digital Curation Center, and Manuscript, Archives, and Rare Book Library (MARBL). Emory University Libraries Conservator Ann Frellsen began the presentation with a project overview. The large scale of the project, combined with the diverse materials in the scrapbooks, required rigorous assessment and planning to fit the project schedule. The forty scrapbooks were narrowed to a group of 34 high-priority items. Then the scrapbooks were assigned to three treatment “levels,” roughly approximating the categories used in ARL (Association for Research Libraries) statistics, based on time and degree of difficulty. The past preservation approach for the collection had been to simply limit patron access by “boxing and forgetting.” For this collection of African American scrapbooks, the library intended to expand access through digitization.
The initial project proposal would have relied on a conservation technician, but the complex construction and fragile materials required a conservator’s skills. The project plan was adjusted, and the second presenter, Kim Norman, became the project conservator. The initial decision tree was quickly abandoned as the diverse scrapbooks were assigned unique treatment plans, corresponding to the specific preservation problems presented by each item. Common problems included folded items, detached components, and overlapping elements. Adhesive stains were generally left in place, where they provided useful evidence in positioning detached items.
In some instances, new support pages were created, but many of the album pages could be encapsulated or placed into unsealed Melinex sleeves to provide support at the page level.
The third presenter, Brian Methot, described the workflow for digitization. The reflectivity of the Melinex was a hindrance to photography, so the sequence of operations was adjusted to provide for encapsulation after digitization. Ehtafoam and binders’ board shims augmented cradles used during scanning. Custom-built platforms supported delicate fold-outs during photography. There was a vacuum table as a part of the photo studio, but the thickness of the materials made the vacuum ineffective. Instead, the photography used a sheet of Acrylite acrylic. Blank pages were also scanned to maintain the correct order and appearance of the pages.
Brian also described technical requirements for the project. The library needed a camera with a faster scanning back to capture details of these large and complex pages. Cool LED lights replaced hot tungsten studio lights as well. The Phase1 camera with Mamiya scanning back was tethered to a an Apple computer running Capture1 software, which handles both image processing and metadata. The process generated three file types: MOS native camera format files, Archival Master files (TIFF at 400 ppi with color target and ruler), and Production Master files (TIFF at 400 ppi, cropped to image).
The presenters further clarified the project details during the question and answer session. A major objective of the project was to make restricted items more accessible to the public. It is hoped that additional metadata can be crowdsourced through the open online repository with the digitized scrapbooks. There will be a digital-first access policy, so researchers will have to request special access to the originals. Regarding the conservation treatment, the paper was not deacidified prior to encapsulation. Pages were not necessarily sealed on all four edges, so this should not be a problem.
The project was successful in providing structural stabilization for the original copies, while also enhancing access to the scrapbooks’ contents. The project was discussed in Kim Norman’s blog and in the New York Times, increasing public awareness of the collection. The project has also begun to yield broader results by connecting community members with collection items.
42nd Annual Meeting – RATS Joint with Objects Session, May 30, “Technical Study and Conservation of the ‘Bat Wing Ship,’ Background, Challenges and Surprising Discoveries, Lauren Anne Horelick , Objects Conservator, Smithsonian National Air and Space Museum
The compelling object at the center of this paper is an experimental prototype of a Nazi German jet powered fighter aircraft discovered by the Allies at the end of World War II and brought to the United States for study. Designed by the Horten Brothers (Reimar and Walter), this craft with a steel structure, paper-thin plywood veneers, and no vertical tail is regarded as a design predecessor to the stealth bomber. The aircraft, a model Horten Ho 229 v3 (the third and final version of this particular airframe) was captured when it was near completion in the Gotha workshop http://airandspace.si.edu/collections/artifact.cfm?object=nasm_A19600324000 Charcoal was said to have been added to the construction adhesives to make the aircraft invisible to radar.
While always a favorite of air flight/military history buffs, this craft has never been exhibited and has been the subject of increased interest in recent years due to what the paper’s author describes as a “sensationalized” documentary entitiled “Hitler’s Stealth Fighter.” This video, available on YouTube, is replete with inaccuracies including the assertion that it is stored in a “secret government warehouse” when, in fact, its current home is the Smithsonian’s Paul E Garber Facility in Suitland, Maryland. However, it will soon be moved to another disclosed location – The Udvar-Hazy Center in Chantilly, Virginia where it will have its big reveal.
In preparation for this move, conservators at the Smithsonian NASM carried out a technical study to inform treatment protocol for the stabilization of the unstable and extensively delaminating veneers. They sought to characterize and identify the adhesives and other materials employed and, in particular, seek evidence for the presence (or apparent lack) of charcoal.
The aircraft is 55.4 feet wide with a tubular steel frame. The engine rests in the center of the craft and it is covered in a plywood skin. There is a clear canopy for the pilot. Due to complications of working on the object in its storage location, the decision was made to disassemble the damaged plywood portions to allow for treatment of the panels in the conservation lab. The composite materials that were examined and analyzed included the plywood board, structural supports and spacer blocks including the adhesives used to attach these portions to one another.
After a literature review of plywood available in Germany before WWII, reference materials were acquired for the potential materials. A sampling protocol was developed and the object and reference samples were examined under visual and Polarized Light Microscopy, FTIR, Raman, and for selected samples XRD was employed. (There may have been other methods employed that I missed in my notes– GC-MS and 3-D microscopy were mentioned in the abstract – sorry if I have omitted something significant.) The analysis was done in conjunction with the Museum Conservation Institute.
The analyses yielded some unexpected results as some of the wood sample results varied from those specified by the Horten Brothers (as reported in their interrogation). However the substitutions of European Beechwood/Scots Pine for the specified birch was not very surprising to the authors given the materials shortages at the end of WWII. The adhesives tested were identified as urea formaldehyde and phenol formaldehyde. Confirming the presence of charcoal in the black paint/adhesive layers proved elusive. The black particles were difficult to separate from the matrix. PLM examination did not support the charcoal identification and they were found to be amorphous with XRD. FTIR analysis pointed to the presence of cellulose, hemi cellulose and phenolics. This could mean oxidized or charred wood – or neither.
Plans for treatment do not include repainting damaged areas as the author mentioned a growing trend toward exhibition of aircraft in a less heavily restored state. Beech veneers will be employed in areas of loss but were unavailable in the United States in the <1mm thickness required so must be ordered from Germany. Because the urea formaldehyde has cross-linked with age and become insoluble, the conservators are not as concerned as they might have been about adding new materials when they choose an adhesive to stabilize the veneers.
Details and updates on this research project and the treatment are available on the on the National Air and Space Museum’s Airspace blog http://blog.nasm.si.edu/restoration/horten-h-ix-v3-bat-wing-ship-may-2014-update/ The Bat Wing Ship is poised to be a popular attraction when it goes on exhibit – I know my interest has been piqued by this interesting talk!
42nd Annual Meeting (Objects Session 5/31/14) – "Testing and implementation of microclimate storage containers for small metals and plastics" by Dana K. Senge
Dana’s talk – the last of the Objects session talks given at AIC’s 42nd Annual Conference in San Francisco – presented the results of multiple tests conducted by the National Park Service (NPS) Intermountain Region Museum Services Program, evaluating several readily available materials for their ability to protect sensitive objects from less-than-ideal climate conditions. Tests sought to identify the best methods for long-term storage of two distinctly different categories of collections materials: archaeological metals and historic plastics. The ideal solutions would be cost effective and easy-to-use, would allow for easy monitoring and access, and could be consistently applied across all NPS sites.
Archaeological Metals
Various storage systems for archaeological metals have been employed at NPS sites in the past, including Stewart boxes, 2-4 mil polyethylene (PE) bags with twist ties, and heat-sealed Marvelseal enclosures in combination with desiccants and/or scavengers.
Following the work done by JP Brown (2010) and Alice Paterakis (2011), Dana did some short experiments to confirm that resealable PE containers with silicone gaskets held a microclimate better than similar containers without gasketing. This being established, she added data loggers and twice the calculated amount of desiccant recommended for the container’s volume, and conducted a longer test in three locations – Arizona, where storage conditions were generally dry (about 35% RH); Montana, where conditions ranged from 25-45% RH; and Texas, where conditions fluctuated around 50% RH. Even under the most humid conditions in TX, the worst-performing silicone-gasketed PE boxes only allowed an increase of 2% RH over the course of the year-long test period. Measurement of the TX test box after a second year registered only another 2.7% increase in RH. Based on this set of experiments, Dana calculates that this particular setup would only require recharging with desiccant every 5 years if a change of less than 15% RH was desired. In addition, Oddy testing of the materials involved in the system confirmed that there was nothing harmful being off-gassed.
Historic Plastics
To find an ideal solution for historic plastics, Dana started by consulting Yvonne Shashoua’s 2008 publication, Conservation of Plastics. She learned that different polymers have wildly varying requirements for safe storage: cellulose nitrate (CN) and cellulose acetate (CA) need ventilated or scavenged environments to slow deterioration, while natural rubber fares better in anoxic environments, and polyvinyl chloride (PVC) calls for only non-absorbent glass or Mylar fabrication materials. The deep trays with Tyvek covers that had been in use at NPS since the 90s were not effective, so alternatives were sought.
For use with CN and CA, several box designs were evaluated for their ability to ventilate the space and prevent dust accumulation inside the box. Acid-free board boxes were made with slatted or screened walls and were tested without lids, with Hollytex lids, or with acid-free board lids. Inside the prototype boxes, Dana placed a deteriorating CA shower curtain ring along with a sticky surface to determine how much dust found its way in, and A-D Strips to monitor for the buildup of harmful acetic acid vapors. Findings supported the use of a blue-board lid, as it prevented the most dust over a month-long period. Though screened and slatted boxes did equally well, the screened boxes were found to be easier to construct. No harmful buildup was detected by the A-D strips in any of the boxes.
As a space-saving alternative to ventilated storage, Dana next evaluated several common scavengers in conjunction with the previously described resealable PE containers. In order of their performance (worst to best), they were Kodak Molecular Sieves, a single MicroChamber board, Getter Pak, two MicroChamber boards, and Zorflex. The most effective adsorbent, Zorflex, prevented acetic acid build-up in the container for 18 days. Interestingly, each scavenger tested lowered the humidity in the box to some extent initially, though it did eventually rebound. A second round of tests that doubled the amount of scavenger found no benefit to doing so. Future work will include evaluating activated carbon cloth, and rerunning the above described scavenger tests on boxes containing a larger amount of deteriorating CA to see if the products can keep up with increased volumes of off-gassed acetic acid. She would also like to test resealable glass containers in this capacity.
Although storage for PVC objects was not extensively discussed, Dana mentioned that she has been using and is pleased with heat-sealed 1 mil Mylar enclosures. She prefers the use of a single-impulse heat sealer to a double-impulse model to make the enclosures.
Finally, Dana made a point to address a few limitations of the systems she evaluated for this paper, including size (the largest silicone-gasketed PE containers she’s been able to find only measure 9 x 12 x 6 inches) and the need for a robust monitoring/maintenance plan.
Questions/comments after the talk:
- One talk attendee mentioned that she had found much larger gasketed PE boxes, but that they didn’t necessarily seal well because of the distance between the clamps, especially on the long edges. She recommended testing the container with water – if it’s not watertight, it won’t be airtight either!
- A question was posed about the efficacy of these systems compared to non-gasketed PE boxes that were sealed with aluminum tape instead. Dana stated that aluminum tape was not evaluated in this round of testing.
- Dana, though she didn’t mention brand names, cautioned that some brands of containers definitely held a better seal than others. Test your enclosures first!!!
I really enjoy hearing about research with practical applications. Thank you, Dana, for a well presented and interesting talk!!
42nd Annual Meeting – Book and Paper Session, May 29, “Conservation of Johannes Herolt’s Sermones de tempore, c. 1450” by Harry Campbell
The Thursday afternoon session of Book and Paper presentations was full of talks about challenging and innovative treatments, and Harry Campbell’s paper “Conservation of Johannes Herolt’s Sermones de tempore, c. 1450” was no exception. Mr. Campbell, Book and Paper Conservator at The Ohio State University Libraries, talked the audience through the steps in treating a newly-acquired manuscript with extensive damage.
Known as one of the most prolific sermon writers of his time, Johannes Herolt was a Dominican friar of Nuremberg and vicar of the Katharinekloster. There are approximately 500 known manuscript copies of his collected sermons, some of which are fragmentary. This copy was re-bound at some point in the 20th century in a less-than-sympathetic binding, and pressure sensitive tape had been applied over areas of badly degraded iron gall ink. Because the manuscript was anticipated to receive heavy use, the decision was made to completely rebind the manuscript in a 15th century German style.
The manuscript was disbound, and the tape was carefully removed from each page using a heated tool. After reducing adhesive residue and staining with acetone, Assistant Rare Book Conservator Molly Carlile worked with Mr. Campbell to line the damaged pages. A lining of very thin tengujo tissue was adhered to one side of each page with dilute paste, and then loose fragments were put back in place using before treatment photographs as a reference. Once all the fragments were replaced, the second side of the page was lined, forming a sandwich. In some places the ink was so highly acidic that nothing of the original letter forms remained.
The mended pages were resewn using the original sewing holes, and two-color endbands were sewn in a style appropriate to the period. New covers were made from hand-shaped American beech boards. The wood, along with the work of milling, drying, and delivering the boards, was donated by William “Bill” Bear, who has also done extensive work to preserve the Fort Salem Indian Mound in Lynchburg, OH. After the new boards were laced on, the spine was covered in alum-tawed leather, and the exposed boards were fitted with metal clasps. The finished product was housed in a custom box, along with binding fragments that were not re-used.
Such extensive treatment is not always possible, or even desirable. However, in this case treatment allowed for the manuscript to be safely handled by students and researchers, and prevented the loss that would have otherwise been inevitable as the tape deteriorated. Thank you to Mr. Campbell for a fascinating and well-presented paper!
42nd Annual Meeting – Research and Technical Studies Session, May 31st, "X-ray Micro Tomography Analysis of Western Red Cedar Secondary Phloem by Peter McElhinney"
What factors contribute to the deterioration mechanisms for cedar bark? Peter McElhinney’s presentation on work completed as an Andrew W. Mellon fellow in object conservation at the National Museum of the American Indian in Washington D.C. addressed this question. His project was inspired by encountering labels on storage boxes for objects in the collection with the words “Inherently Fragile: Will Have Continued Loss.” Peter set out to better understand why cedar bark deteriorates so rapidly and dramatically.
Objects made from cedar bark come from Western Red Cedar trees that grow in the North West coast region of North America. Native groups in that region harvest and weave cedar bark to make baskets, hats, mats and other objects. Cedar trees can grow to between 65-70 m tall and 3-4 m in diameter. One of the unusual features of these trees is the way that the bark is made and the type of cells present on the exterior of the bark. Peter focused on four aspects of cedar bark that play a major role in the way it deteriorates: the disruption of the cells on the exterior bark, calcium oxalate crystals, dehydration of pectin, and phenols.
Peter demonstrated the changes to the bark’s cellular structure using diagrams and CT scans. Cedar bark, called phloem, is made up of sieve cells, parenchyma cells and fibers. Cross sections of bark examined with a Skyskan 1172 micro CT scanner from Micro Photonics Inc. enabled the differentiation of inner and outer phloem. The cells in inner phloem, the section of the bark closest to the tree, are orderly, more rectilinear, and less disrupted. As the cells are pushed towards the outside of the tree, they become outer phloem, and develop a more disordered, compressed, less rectilinear appearance. The fibers in outer phloem have stronger cell walls, whereas the parenchyma and sieve cells tend to be crushed or squished. These changes in the phloem relate directly to the shedding characteristic of objects made from cedar bark.
The CT scan also revealed the presence of a large bio-mineral crystal in the bark sample. These bio-minerals form as part of the normal function of cedar trees based on minerals absorbed from the soil. Scanning electron microscopy with energy dispersive spectroscopy identified small, shard-like crystals as calcium oxalate and the large particle as a silica aluminum crystal. The small shard-like crystals were most abundant in the cell walls in the middle and outer phloem. This corresponds with literature that cedar trees have 10-20 times as many calcium oxalate crystals as other trees. These crystals may cause cell wall abrasion during manipulation of the cedar bark, which could contribute to the bark’s rapid deterioration.
The dehydration of the pectin and phenols also affect the cells. Cedar bark used for objects loses moisture over time, which can cause the dehydration of the pectin in the bark. Dehydrated pectin may reduce the ability of cells to adhere together. Significantly higher numbers of phenols are present in the outer phloem than in the inner phloem. The phenols protect the bark from ultraviolet radiation damage. This characteristic could influence lighting requirements for objects made from cedar bark if we can determine whether they are made from inner or outer bark.
Conservation applications of these findings help to improve understanding of how cedar bark deteriorates. The cells in outer bark are already structurally compromised, which can contribute to the shedding associated with cedar bark objects. Calcium oxalate crystals can further damage cells during handling of the object. Dehydrated pectin reduces cell adhesion within the bark. Finally, phenols present in high quantities in the outer bark may project the material from damage due to Ultraviolet radiation. Overall, this talk applied complex information about cellular biology to develop a better understanding of cedar bark deterioration mechanisms. This information is essential for developing better preventive care handling procedures for these fragile objects. I’m looking forward to reading the post prints for this talk and studying the figures and images in more detail.
42nd Annual Meeting – Electronic Media Session, May 31st, “Establishing Time Based Media Conservation at the National Galleries of Scotland; Creating More in Times of Less" presented by Kirsten Dunne, paper conservator at the Scottish National Gallery of Modern Art in Edinburgh, Scotland
I really enjoyed Kirsten’s Dunne’s talk because she addressed a challenge that all conservators face regardless of their specialty. That is developing economically viable and sustainable solutions for collections management which are flexible enough to anticipate and adapt to a future that includes an increasing amount of time-based media and other conceptual or intangible works of art. Ms. Dunne, a trained paper conservator, has nobly volunteered to take on this challenge in addition to her regular duties because, as in many institutions facing cuts and austerity measures, there is no budget for a full time, time-based media conservator at the GMA. So, how is she faring and what advice does she have for the rest of us?
The Scottish National Gallery of Modern Art currently has around 20 time-based media works. The first challenge that Ms. Dunne faced was to locate each one and manipulate Mimsey, the GMA’s CMS, to make sure that each was properly characterized and documented. She stressed the importance of an artist questionnaire or interview at the time that each piece is acquired. This is the best way to insure that the information gathered is accurate and also an appropriate time to make a record of any contemporary technology that may be required to display the work (such as a VHS or laser disk player, projectors, or sound equipment). This information is especially important if your institution has purchased a master copy for loan and repeat display, as opposed to an exhibition copy that must be disposed of after a single showing. The legal implications of this had never occurred to me, nor the fact that proper and complete erasure of an artwork can be an issue. This was part of the underlying theme of Ms. Dunne’s talk which cast the conservator as ethicist. It became her job to answer legal and moral questions about the work such as ‘How many copies can be displayed simultaneously?’ and “Who should have access to the digital files?” She said that she was compelled to question who she was as a professional and that the exercise ultimately reinforced her confidence in her own knowledge base and the ethical principles which she cultivated during her training.
Ms. Dunne went on to say that one excellent source of guidance was “Matters in Media Art,” a collaboration between MoMA, SFMoMA, the New Art Trust (NAT), and Tate, which has an established time-based media lab. The project, which can be found here, is “designed to provide guidelines for care of time-based media works of art.” The templates provided her with a list of questions which assissted her research and shaped her approach to documentation. Gradually, she said that she began to “close the knowledge gap,” and to implement some quick organizational strategies. These included:
1. Physically consolidating time-based media works in storage and documenting their new locations
2. Entering new information fields and consistent keywords in the museum’s CMS in order to describe and track pieces and
3. Drafting a preservation management plan for electronic and time-based media, which included an “Equipment Asset Register” to track on site audio visual equipment and which could be programed to send an alert when that equipment was in danger of expiring
Ms. Dunne offered some excellent advise for any conservator who is faced with unfamiliar materials and formats, namely:
1. Trust Your Instincts because the broader principles of conservation will hold true and
2. Embrace the Chaos! because the best way to learn is by doing.
She also talked about the value of involving your colleagues such as curators, registrars, and IT staff. Sometimes it can be a challenge just to get others to recognize that a conservator should be involved from the beginning regarding decisions about display and storage, even if there is nothing currently “wrong” with the piece. Often, a general lack of experience with new media pieces leads to fear, and consequently, neglect. She explained that she was able to barter her time and expertise with time-based media conservators at other institutions whose experience proved to be invaluable. In fact, interinstitutional sharing can extend to those ancillary components like betamax machines or tape decks, and she suggested partnering with other institutions to create a repository of such devices. This approach can cultivate good will and also form a visible, public partnership.
In summary, Ms. Dunne found that while establishing her museum’s nascent draft of core guidelines for conserving and exhibiting time-based media was challenging, it was a rewarding experience. She reported that she made allies in the field, added to personal and institutional knowledge of the collection, and came to regard herself as “a conservator” rather than “a paper conservator” who was prepared for the challenges posed by an evolving artistic landscape. Her concluding words to institutions were these: “ If there is someone on your staff who wants to take on a similar project or responsibility for your time-based media collection, give them that freedom! You will benefit tremendously.” And to educators and conservation professionals: “Continue to act as mentors. I’ve been lucky to have the support of those in the field.”
42nd Annual Meeting, Textiles Session, May 29th: A Case Study Using Multi-band and Hyperspectral Imaging for the Identification and Characterization of Materials on Archaeological Andean Painted Textiles by Rebecca Summerour and E. Keats Webb
The paper began by acknowledging a third author who was inadvertently left off the program and abstract booklet, but will appear as a third author in the TSG Postprints. The paper was presented by E. Keats Webb, the digital imaging specialist for the Conservation Institute at the Smithsonian. She showed how by combining a lower resolution spectral camera (Surface Optics Corp SOC710) with a modified DSLR with bandpass filters, the resulting images could be used to identify certain pigments on a painted textile. The project began with four textiles being described as plain weave with color (a limited color palette of browns and blue/blacks) delivered in a paste form without an organic binder, the color remaining on one side – this is important, keep this in the back of your thoughts as you continue, dear Reader!
I live in Silicon Valley, but I am not tech savvy. I am also several years out of school and realize that I my not have the vocabulary to give a precise recall of the methods and analysis described. Having said that, I feel I did learn about a (relatively) low cost technique that would be helpful in characterizing pigments on textiles. Essentially, the technique required several images to be taken at various bandwidths along the visible to near infra-red spectrum. Knowing the reflectance spectra for a given pigment allows the researcher to target the images for analysis. The targeted images are overlayed to get the difference which results in areas that appear to fluoresce for a positive identification.
It was found that indigo was readily identified, whether it was used alone or as a component of other colors. Reds and browns proved a bit more problematic. The success of this technique seems to have been that there was a small color palette, as well as the textiles in question were of known provenance, so they already had an idea of the pigments to look for. Also, the pigments were on one side and in good quantity. They did not achieve good results with dyes or small samples due to background noise interference. Though it was brought up in the question/answer portion that HPLC gives definitive “fingerprint” spectra for positive identification, the imaging technique presented does not require sample-taking (important to the National Museum of the American Indian) as well as allows for the entire textile to be mapped, keeping the pigment identification within context.
I could see this technique as a very useful first step in pigment identification or potentially in identifying areas of restoration and the pigments used. I look forward to reading the paper in the Postprints.
Recoloring Faded Taxidermy – Research into the Properties and Applicability of Dye Materials for Conservation Treatment.
In 2013, the American Museum of Natural History and Yale University’s Center for Conservation and Preservation were awarded an Institute for Museum and Library Services’ (IMLS) National Leadership Grant to fund a three-year project devoted to the development of best practices for recoloring faded taxidermy mounts displayed primarily in habitat dioramas: Recoloring Faded Taxidermy – Research into the Properties and Applicability of Dye Materials for Conservation Treatment.
Follow the research through the project blog – In Their True Colors: Developing New Methods for Recoloring Faded Taxidermy [http://intheirtruecolors.wordpress.com/]. The blog is now live – add your comments and questions to be addressed in subsequent blog posts!
After years of display under bright lights, and harsh temperatures and humidity, many taxidermy mounts have become discolored and faded. Techniques for restoring the lost colors of damaged natural history collections are limited and under-researched. This knowledge gap puts at risk collections of great educational value, especially as some historical specimens represent species that are endangered, if not already extinct.
The project conservators are interested in developing re-coloring methods that would minimally alter the texture or sheen of hair and fur, and could be as reversible or re-treatable as possible.
This research will foster cross-disciplinary partnerships between conservators and scientists with varying forms of expertise, helping to bridge the institutional gap between natural history, art, and history museums and collections.
The IMLS-funded project will build upon promising results from a pilot study conducted by the Museum into the use of certain dyes, such as those used in certain specialized printing inks, to recolor taxidermy hair and fur. The next few posts will present the results of the restoration project that resulted in the dramatic restoration of the faded specimens in the habitat dioramas in the Museum’s Bernard Family Hall of North American Mammals.
The findings from the study, which the Museum conservators presented at 2012 annual meetings of the Society for the Preservation of Natural History Collections (SPNHC) and the American Institute for Conservation (AIC) and published in the October 2012 International Committee of Museum, Natural History Collections Working Group Newsletter, were received with immense interest by practitioners and researchers alike. Together with results from a national survey among conservation professionals, it was evident that there was a strong need for comprehensive research to explore additional materials and discover an appropriate method for recoloring faded taxidermy in museum collections.
Posted on behalf of Elizabeth Nunan
Associate Conservator
Natural Science Collections Conservation
American Museum of Natural History
Almost all the Way to Timbuktu: A Photograph Conservation Workshop and Re-housing Project in Mali
Almost all the Way to Timbuktu:
A Photograph Conservation Workshop and Re-housing Project in Mali
by Heida Q.S. Shoemaker
1. 
I visited Mali in the summer of 2011, and fell in love with the country. I knew I had to return, and had to do something that would mean something, that would be a contribution to the people of Mali, and enriching for my own career as a conservator. My plan was to visit the site of the ancient manuscript libraries of Timbuktu, many of which were recently consolidated in a new conservation center (IHERI-AB). I had been invited by Dr. Abdel Kader Haidara, a curator who is one of the initiators of the preservation of these invaluable medieval African manuscripts. I wanted to view the training and preservation efforts at this site, and discover a way in which I could become involved in this important work. Unfortunately, a few months after making my plans, a coup d’état, and subsequent rebel insurgency in Northern Mali, rendered this plan impossible.
I had to switch directions, literally. Being both a photograph and a paper conservator, I chose to concentrate on the subject of photograph conservation instead. Bamako, the bustling capital city of Mali, is an important center of contemporary photography in Africa. The African Photography Biennial (“Rencontres de Bamako”) is held in Bamako every two years. This collection of exhibitions highlights the current contemporary photographers working in Mali and the rest of Africa today. Photography as a profession has also become an important route for young Malians – both fine-art and commercial photography. There are also many collections of historical and ethnographic photography, housed in various institutions in Bamako. All of these collections of photography are very important, and it is known by those charged with their care, that their preservation for current and future study and cultural heritage is paramount. Yet there is a lack of vocabulary, knowledge of conservation techniques, and resources in Mali, which I believed could be addressed through international exchange, collaboration, and education.
I visited many institutions in Bamako, to gain an understanding of the environment in which collections of important historical and contemporary photos were being cared for. The strongest connection I made during this second trip in 2012, was with the private photography school, CFP (Cadre de Promotion pour la Formation en Photographie).
I decided that I would initiate my contribution to the preservation of photography in Mali by running a workshop, hosted by CFP.
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The Workshop – “Preservation of Photography”
The workshop at CFP (Cadre de Promotion pour la Formation en Photographie) was planned for two days in October 2013. This setting was chosen because of the students background and training in digital photography, as well as in traditional darkroom techniques. The director of CFP, M. Sogodogo, was trained originally as an Art Conservator, at the Musée National in Bamako, and he has maintained an interest in the preservation of the photography that the students create, as well as the preservation of the work of well-known Malian photographers in his care. He also stresses the importance of learning about traditional black & white photography, both in terms of creation, and care. The students at CFP were the perfect candidates for studying how to save prints and negatives from the dangers of age, light, pollutants and natural and man-made emergencies that threaten them every day.
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The workshop, for 15 CFP students, consisted of both lectures and hands-on activities. In this way, the students could be introduced to both the theory and practice of art conservation. The unique combination of science, art history, knowledge of materials, and hand-skills would be demonstrated as being the fundamental aspects of photograph conservation. The first day, the emphasis was on the history of photographic processes and deterioration, from daguerreotypes to digital photography. Stress was placed on the importance of learning about historic processes – how they are made, how they deteriorate, and how they should be preserved – in order to preserve the history and patrimony and archives of Malian culture. Historic albumen prints of Mali from the early 19th century were presented as examples documenting history and the student’s heritage – important records of early colonial presence and architecture and commerce in Mali.
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The second day focused on the environment, storage and treatment of photographs. Along with a power-point presentation, most of the day was given over to hands-on activities, a time for the students to experiment with different treatment techniques for the first time. Prints were bathed in water-baths, paper and adhesive remnants were removed, tears were repaired, and mounting techniques were demonstrated and practiced. In bathing the prints, the students experienced the wide range of factors and consequences of conservation treatment. They witnessed the vulnerability of wet emulsions, and yet saw the stability of a photographic image exposed to water. They learned how water could be the destructive force in a flood, yet it could be the element which also saves the photograph, when a stack of photos adhered together can be separated, and saved.
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The students were amazing – absorbing so much new material, and demonstrating their interest with very complex, thought-out questions. They especially loved washing various types of photos, and observing the results. A few of them spoke of their new-found interest in continuing the study of photo conservation. This was one of the goals of the workshop – to begin to build interest in preservation, and equip students and art professionals in Mali with the vocabulary and basic understanding of photo preservation.
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The students received “Diplomas of Participation in the Workshop on the Conservation of Photography”. They were very proud of these, and I was also proud of their interest, hard work and concentration on a subject matter so new to them.
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Re-housing project for the negatives of Malick Sidibé
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The second part of the project was to begin re-housing the negatives of the Malian photographer, Malick Sidibé. Sidibé opened “Studio Malick”, his photography studio in the Bamako neighborhood of Bagadadji, in 1962. He set up studio shots here – of friends, athletes, engaged couples, professionals – and also went to and recorded dance parties of the 60’s, and street scenes of everyday youth in the thriving capital. His personal collection of negatives and contact sheets (glued onto paper folders, “chemises”, and labeled and numbered in his hand-writing) fill one room of his home. His most precious negatives are stored on an open shelf – floor to ceiling – against one wall. Each roll was cut into strips, placed all together in an acidic paper folder, labeled with the date, and stacked in original yellow Kodak film boxes. Red dust, ubiquitous and unstoppable in Mali, covered every surface, and had made its way into the boxes and acidic paper enclosures.
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Having visited Malick the previous year, I decided to concentrate on this collection when I returned the following year. I purchased supplies ahead of time, which I carried in my luggage, arriving at the photographer’s home on the back of another ubiquitous sight in Bamako – a small motorcycle called a Jakarta – which was driven by Malick’s nephew.
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We discussed the project, and I began cleaning a small selection of his medium format b/w negatives, and re-housing them in mylar envelopes and archival boxes. Each envelop was labeled with the same information that Malick had been so careful over the years to mark his negative envelops with. In contemplating the issues involved in this re-housing project, I had considered whether it was more appropriate to leave the original negative housing as Malick had designed it. Yet the stacking of the negatives all together, causing abrasion, and the ever-present heavy dust gathered through the years in the porous boxes, convinced me that a more “archival” protective system was necessary. I also made the choice of mylar over paper enclosures due to the significant consideration of handling. The negatives were handled often, both by the photographer, his sons, and clients. Mylar would protect each negative strip, while providing visibility. Mylar would also render them impervious to dust and pollution, whereas the porous and less-sealed nature of a paper envelop would allow dust to again settle on the negs. Although mylar is not considered ideal in a hot climate, the lack of high humidity made the choice of mylar reasonable in this case, due especially to the high volume of handling predicted. The original paper envelops with the photographer’s hand-writing will be preserved in the new boxes as well.
I was only able to complete a small amount of this work, but hope to continue the project on a larger scale very soon.
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Lastly, to come full circle, I finally met M. Abdel Kader Haidara! During the invasion of Timbuktu in the spring of 2012, it was thought that many of the ancient manuscripts had been destroyed. But thanks to Drs. Abdel Kader Haidara and Stephanie Diakité and others who helped, 300,000 manuscripts were packed in metal crates, and whisked off to safety. They are now biding their time in Bamako, waiting until it is safe enough to go home to Timbuktu. I was fortunate to be able to visit one of the safe-houses where a large group of archivists and technicians are painstakingly archiving and making boxes for each manuscript, storing them in environments controlled by silica gel and de-humidifiers, to mimic the much drier conditions of the desert from which they came. To learn more about this amazing effort, visit the site of T160K (Timbuktu Libraries in Exile) at http://t160k.org
With all of the turmoil of the coup, the invasion by insurgent rebels, and the destruction of monuments in many northern Malian cities, it was amazing to see these beautiful, hugely significant books safely protected from harm.
My experience designing, planning, and implementing this project was extremely thought-provoking, stimulating, and satisfying. Each step was led by my long-held dedication to conservation, and my new-found connection to Mali. I would never have guessed that a touristic visit to Mali with my mother three years ago would lead me to standing in front of a group of young eager-to-learn Malian students, or to dusting the surface of the negatives of one of the most important living Malian photographers. I plan to continue this work, broadening my scope by working with other professionals who are interested in the outreach of photograph conservation to Africa. I have joined, as a consultant, a larger project for the preservation and digitization of the archives of multiple Malian photographers, and hope to train the group on the ground who will be implementing this project. And, I hope to finally make it to Timbuktu, to visit the ancient African manuscripts when they have been returned to their rightful home.
I want to thank:
The American Institute for Conservation Photographic Materials Group (AIC-PMG) for the 2013 Professional Development Stipend Award
The Winterthur Museum and University of Delaware Program in Art Conservation for the 2013 Betty Fiske Professional Development Award in Contemporary Art Preservation
My contributors to my Indiegogo campaign, “Save Photographs in Mali” for their generous contributions and support. See my Indiegogo page at: http://igg.me/at/savemaliphotos/x/2688784
The Foundation of the American Institute for Conservation for the 2012 Carolyn Horton Grant, which was used for my preliminary trip to Mali for research and making connections, in preparation for the workshop and re-housing project.
Debbie Hess Norris, for providing most of the images used in the workshop presentation. This was an invaluable contribution to my workshop.
Karen Zukor, for providing advice on giving workshops in foreign lands, and for the contribution of supplies to the workshop.
Amadou Ouologuem, for his inspiration for my project, and help with my travels to Mali.
Captions for images:
1. Admin. Minga Siddick (left), H. Shoemaker, CFP students, Director Sogodogo (right), photo by CFP, 2013
2. CFP students bathing photos, photo by H. Shoemaker, 2013
3.& 4. Left: CFP students bathing photos Right: Heida demonstrating surface cleaning of negs, photos by CFP, 2013
5. & 6. Left: 19th c. Albumen print of Bamako Market Right: Contemporary photo of same market, re-built after a fire
7. & 8. Inpainting exercises, photos by CFP, 2013
9. & 10. Left: Student Bintou Diarra showing photo-corners exercise, Right: Zoumana Sidibé with photo-corners exercise, photos by H. Shoemaker, 2013
11. & 12. Left: Heida (left), CFP students, M. Sogodogo (right) Right: Heida with student Ousmane, photos by CFP, 2103
13. & 14. Left: © Malick Sidibé , “Nuit de Noel” 1963; Right: © Malick Sidibé “Jeune homme” 1977
15. & 16. Left: M. Sidibé examining his negatives Right: M. Sidibé’s storage system, photos by H. Shoemaker, 2013
17. Re-housing M. Sidibé’s negatives, photo by A. Cissé, 2013
18. M. Haidara with a Timbuktu manuscript, photo by H. Shoemaker, 2013
About the Author:
Heida Shoemaker is a professional paper and photograph conservator. She received her Masters in Science from the University of Delaware and Winterthur Museum Master’s Program in Art Conservation in 1996. Since starting her private practice in Berkeley in 1998, she has worked with the general public, framers, and museums to care for their fine art on paper and photographs, family photographs, and archival material. She does contract work for institutions such as the Cantor Art Center, Stanford University; The San Francisco Museum of Modern Art; The Berkeley Art Museum; and The DeYoung Museum, SF. Heida has also held a Getty Advanced Fellowship in Paper Conservation at the San Francisco Museum of Modern Art, 1997 – 1999, and a yearlong fellowship at the Palace of the Legion of Honor, Fine Arts Museums of San Francisco. Heida has traveled to Mali three times between 2011-2013 to perform research, teach on photograph conservation, and care for Malian photography collections.