Beth Nunan of the American Museum of Natural History described an almost 10-year approach to gather data across the many departments of the museum, using the cultural property risk assessment model (modified for AMNH). No one wants their risk assessment survey to sit on a shelf, and one thing is for certain: if the data cannot be compared across collections, the data will stay unused and uninterpreted. Even if the data is used, it can be called into question if the tools that captured and analyzed the information are perceived as biased.
Here are some of the takeaways from the AMNH approach:
1) The more complex the collection program at a museum, the more difficult it is to comprehensively apply and manage a risk assessment project. At the American Museum of Natural History there are millions of specimens ranging from vertebrates to botanical specimens and including libraries and archives.
2) There is a trend that AMNH is following about being able to compare risk assessment data with other like museums. Sharing risk assessment data and finding benchmarks across the museum field is becoming important; so risk assessment surveys should consider what will be the common data points shared with other museums, and what the definitions of those data points are.
3) Once tools are developed they should be shared with other professionals to amplify the use of the tools at other institutions. Groups like Collection Care Network and others are seeking to standardize templates and tools in order to facilitate comparison.
4) Partners are crucial to the success of risk assessments. Partners are frequently allied professionals, such as curators, librarians and archivists.
It’s clear that AMNH has many challenges in developing the tools it has used for risk assessment, but I expect we will hear much more from the conservators there as they promote their tools and lead other natural history museums towards this smart way of evaluating risks.
Category: Topics
42nd Annual Meeting – Paintings Session, May 29 “Illumination For Inpainting: Selecting an Appropriate Color Temperature” by Steven Weintraub
So why do conservators prefer northern daylight for inpainting? In Steven Weintraub’s talk titled “Illumination For Inpainting: Selecting an Appropriate Color Temperature” which he presented in the Paintings Session at the 42nd Annual Meeting in San Francisco, he answered this question, as well as a few others about light sources and selecting an appropriate color temperature.
Steven explained how, in his opinion, it is the distribution pattern of skylight that helps make it so ideal. When diffuse skylight from a north-facing window enters a room, there is a “soft” directionality. This type of light distribution avoids the problem of harsh shadows typically associated with point sources of light. It also avoids the opposite problem of flatness due to the absence of shadows, a condition associated with diffuse sources such as over-head fluorescent lamps.
Using only skylight or daylight for inpainting, however, sets the conservator up for two problems: The first, as Steven mentioned in his abstract, is that the availability and control of northern daylight limits the amount of time, and the location in which it can be used. This becomes a real problem if you happen to be facing a tight deadline during the short winter days in the northeast, or like myself, have constantly changing lighting conditions, such as those during the bout of thunderstorms that we often have here during Houston summers. The second problem, which Steven explained in more detail during his talk, is that the spectral power distribution of typical sources of gallery lighting is pretty much the opposite to that of daylight. The result is that if inpainting is done only with daylight, it increases the risk of metamerism when exhibiting the artwork in an electric lighting situation utilizing a warm color temperature source.
It is for both these reasons that many conservators opt for a mix of electric light and daylight for inpainting, and when possible, test the matching of inpainting in the lighting conditions for which it will be displayed.
But, how does one choose an appropriate electric light source? Steven explained his research and suggested that selecting an appropriate color temperature with adequate color rendering properties was a key.
Apparently, color temperature in the range of 3800° Kelvin is the magic number. From Steven’s talk, I learned that color temperature within the 3800°K range is the transition point between warm to cool on the color temperature scale. Within this color temperature range, Steven theorizes that one gets the best balance of saturation with warm and cool colors.
Steven concluded his talk by illuminating a pair of reproductions of a very well known painting by René Magritte, demonstrating the difference in appearance of the image in various color temperature lighting conditions. This showed how the moderate (3800°K) range really did look the best.
ECPN Webinar: Beyond the Prerequisites: Preparing for Graduate Education in Art Conservation
Attention Pre-Program Conservators! Join us for the latest upcoming webinar hosted by the Emerging Conservation Professionals Network (ECPN) on “Beyond the Prerequisites: Preparing for Graduate Education in Art Conservation.” This will be a dynamic webinar with representatives from five North American graduate programs in art conservation. Join Debra Hess Norris from Winterthur/University of Delaware, Ellen Pearlstein from UCLA, Rosaleen Hill from Queens University, Peggy Ellis from NYU, and James Hamm and Meredeth Lavelle from Buffalo State as they discuss a few of the qualities that make a good candidate for graduate training. Learn how to make your application stronger while enriching your career. Submit questions for the Q&A session of the program beforehand by commenting on the ECPN Facebook page or in the recent webinar announcement on the AIC blog (conservators-converse.org), or by e-mailing Megan Salazar-Walsh, ECPN Chair, at salazar.walsh@gmail.com.
The webinar will be held July 16th at 12pm EST. You can register using this link: https://www2.gotomeeting.com/register/177805026
This webinar is the latest in the ECPN series that seeks to address issues faced by emerging conservators. “Emerging conservators” are defined as those with 7 or fewer years of experience (which includes schooling and pre-program). ECPN strives to rotate webinar topics between those that are specifically pertinent to pre-program, graduate, and post-graduate emerging professionals.
42nd Annual Meeting – Research and Technical Studies, May 29, "An Examination of Light-Induced Color Change in Anoxia and Hypoxia using the Microfading Tester " by Vincent Beltran, Jim Druzik, Andrew Lerwill, and Christel Pesme
Vincent Beltran from the Getty Conservation Institute presented this talk in the Research and Technical Studies session. The study presented examined the effects of anoxia and hypoxia on light-induced color change in a sample set containing a variety of materials. The goal was to examine the use of these environments in storage and exhibits as part of an effort to improve the experience for visitors viewing light-sensitive items.
The talk was organized into four parts: “Introduction,” “Experimental Method,” “Microfader Results,” and “Comparison to Lightbox Study.”
In the introduction, Beltran reviewed traditional practices to mitigate the damaging qualities of light. For example: reduce light levels, limit exposure time, rotate exhibit items, and store items in the dark. He then provided an overview of the photo-oxidation process, and the theories behind the use of anoxic and hypoxic environments for storage.
A 2012 study of 125 colorants exposed in a halogen lightbox for 17.5 MLux hours at 22° C, 40% RH with oxygen levels at <10 ppm indicated that 90% of these items studied showed reduced color change as compared to the same items stored in air. To the authors, the logical extension of this study was to transfer the test to the microfading tester and compare the results.
The design of the lightbox for the microfading tester study involved a xenon light projecting through ¼” starfire glass to items on a sample stand. Light was reflected to a spectrometer located above the glass. A ½ cm gap existed between the samples and the glass. The microfader was located above the case while the colorants were inside the case. The colorants consisted of 3 blue wool, 4 organic dyes, 2 leaves, 1 grass, 5 gouaches, 1 watercolor with prussian blue, 1 Kremer Prussian Blue, and 1 Crystal Violet. The colorants were exposed for 5 MLux hours in air, anoxia (<200 ppm oxygen), and hypoxia (1% and 5% oxygen). Reflectance spectra were obtained and combined for a color change plot.
The results of the microfading tester study showed that for the most part color change in air is higher than that in anoxia. Anoxic environments seemed to be generally equivalent to the 1% oxygen environments. A few colorants exhibited a slightly decreased change in the 1% environment but Beltran indicated that these results were inconclusive. A few exhibited increased change in the 1%. Environments with 5% oxygen tended to exhibit more change than anoxic or 1% but generally not as much change as found in air. The exception to this is Prussian blue, which shows the opposite behavior – an air environment showed the least change, 5% followed, and 1% and anoxic showed the most change. Overall, the results showed that 12 of the 18 colorants exhibited greater change in air while only one (Prussian blue) exhibited the greatest change in anoxia. Generally, hypoxic environments exhibited less change than air.
Beltran then presented a comparison between the 2012 study and the more recent microfader study. The main differences in the studies were as follows:
Study Component: Microfader Lightbox
Light Source: Xenon Halogen
Exposure level: 5 MLux 0.01 MLux
Exposure time: 3.5 hours 1750 hours
Exposure type: Continuous Start/End
Area exposed: 4 mm spot Broad exposure
In general, the color change with the lightbox test was higher than that seen with the microfader, though some samples showed changes which were roughly equivalent. Most items showed similar behavior between the two techniques but the lightbox displayed increased change. The differences in the studies were typically within one blue wool step, and the study was able to consistently classify relative color change between the two techniques. However, Beltran stated that there is reciprocity failure between the two studies.
Future goals of this project are to repeat the analysis with more samples, examine the effect on reciprocity for the microfading tester at reduced light intensity, and study the color change in various RH and temperature levels.
Questions were as follows:
Q: In cases where the microfading tester and lightbox didn’t agree, is the lightbox the more reliable?
A: In general, lower light exposure tends to be closer to what you’d get with the microfading tester but that doesn’t mean reciprocity is holding.
Q: Has the microfading tester been tried with a halogen bulb?
A: No, they tried to modify a halogen source but it didn’t do much.
Q: Were control samples used?
A: No, they were not..
42nd Annual Meeting – Research & Technical Studies, May 31, “Development and Testing of a Reference Standard for Documenting Ultraviolet Induced Visible Fluorescence” by Jennifer McGlinchey Sexton, Jiuan Jiuan Chen, and Paul Messier
Jennifer McGlinchey Sexton, Conservator of Photographs at Paul Messier, LLC, presented on the testing of reference cards and the development of new imaging protocols that are so desperately needed in our field for increased standardization and comparability of photographs taken of UV-induced visible fluorescence phenomena. The project started by private photograph conservator Paul Messier in 2006, under the servicemark name UV Innovations (SM), was taken over by Jiuan-Jiuan Chen, Buffalo State’s Assistant Professor of Conservation Imaging, Technical Examination, and Documentation at Buffalo State College. Sexton has directed development of the Target-UV™ and UV-Grey™ products since 2012.
Many a visual examination is followed by technical imaging, including both Ultraviolet Fluorescence (UV-FL) and Visible-Induced Luminescence (VIL), and Sexton’s talk first reiterated why observing cultural material by using carefully selected wavelengths of light is important: It is non-invasive, relatively inexpensive, accessible, and (largely) commercially available. As a surface technique, UV-induced fluorescence probes outside layers, coatings, optical brighteners, mold, tidelines, and organic-glaze pigments above bulk pictorial films. Although it is a technique we rely on for the large majority of condition assessments and technical studies, our documentation remains unstandardized, and essentially, unscientific. With so much to gain by standardizing our capture and color-balancing process, as well as by taking careful notes on the equipment used, the prospect of the Target-UV™ and UV-Grey™ UV-Vis fluorescence standards is certainly an exciting one.
UV-FL images are unique in that they contain diagnostic color information, hence the need for standardization, which would enable cross-comparison between colleagues and between before- and after-treatment documentation. The beta testing of the UV target which was been carried out for 2 years has attempted to account for the most significant variables in the production of UV-FL images. The talk evidenced the enormous amount of collaboration and communication needed to streamline the significant aspects of equipment choice, the optimization of acquisition, and the documentation of post-processing methods. The goal was to increase reproducibility and comparability. Sexton’s presentation showed that the beta testing of the product achieved demonstrable results in terms of uniformity of output.
Development of the UV target was begun in collaboration with (Golden) to produce stable fluorogenic pigments of known color values and known neutral-gray values (which were evidently produced by mixing the red, green, and blue fluorogenic pigments). Neutral gray was defined as a gray which was interpreted as neutral by many viewers and which performed similarly under many different conditions. Including such color swatches within a photograph–for the purposes of color-balancing and correcting any variation in the Red-Green-Blue channels for each pixel–is a very familiar principle in visible photography.
A second consideration made for the round-robin testing was that of intensity, which is a variable somewhat unique to UV-FL photography. The nature of the emissive source must be noted for purposes of calibration and exposure, especially as all light sources currently used in fluorescent photography lack stability over long periods. The output of a lamp with fluctuate over time, and this makes relative intensities of materials illuminated with some lamp types very difficult to determine. Even when this particular factor is taken into account, other variables, such as the distance of the lamp to the subject and the wattage of the lamp will effect intensity. It is also possible that multiple emitting sources could be present. These factors should be included in the metadata for the exposure.
To control for this intensity factor, beta testers were to divide their sources, distance-to-subject, and wattage parameters into three different intensity levels which were best matched to certain analyses: “Ultra” was beta-tested for analysis of optical brighteners and other products produced specifically to fluoresce. “High” was best for the analysis of natural and thicker fluorescence, perhaps of a paint film such as zinc white, of some feathers (see Ellen Pearlstein’s talk from this year “ Ultraviolet Induced Visible Fluorescence and Chemical Analysis as Tools for Examining Featherwork”), and uranium glass colorants; and “Low” was used to image thin applications of resins, varnish, and sizing films.
A third variable was that of camera sensitivity, which varies with manufacturer (proprietary internal filtration and software), camera type (either DSLR or digital back cameras), as well as with sensor type (CCD or CMOS, modified or unmodified). Different filters were tested (Kodak Wratten 2e pale yellow filter, PECA 918, and an internal blue-green IR (BG-38) filter). These types of internal filtration are typical on digital cameras to block out IR and some red light to bring the camera output closer to the typical photopic curve of the eye and more closely mimic human vision. The 2e filters UV radiation and a small amount of the blue light commonly emitted by UV lamps, while the Peca 918 is used for IR blocking.
The fourth variable tested was the source type. Those tested included low-pressure mercury, high-pressure mercury, arc and metal halide arc lamps. Although LEDs were used at some institutions, many of these have a peak emission at 398 nm, which is barely in the ultraviolet range. Greg Smith at the IMA analyzed Inova X5 UV LED, and found that it does contain UV but is more expensive. Other products show a large difference in emission peaks which often cannot be accommodated by a simple white-balancing operation. Therefore, testing limited the peak emission to the most common types, emitting between 360 and 370 nm.
The last variables that were analyzed were those of post-processing procedures and software and of user perception and needs. An problematic paradigm identified over the testing period was that of the image being readable or resolvable vis-à-vis a particular argument versus the image being strictly accurate and well-calibrated. A photograph may accurately render the intensity of the fluorescence but it may be so completely underexposed so as to be unreadable.
Testing showed that, despite these difficulties of calibration and subjective experience, that the workflow incorporating the UV Innovations standard, showed a marked increase in standardization. Round-robin testing was completed by eight institutions in the US and Europe in May 2013. Fluorescent object sets were shipped along with the UV standard and filters. Each test site collected two image sets, one named “a,” using the lab’s current UV documentation protocol with color balance and exposure set “by eye,” and the other named “b” using the UV innovations protocol. The increased control provided by the use of the standard was evidenced by the average delta E of L*a*b* data points as well as the average standard deviation of RBG data points for both a and b sets as each institution. By way of example, the ‘Low—a” set showed an improvement from a delta E of 18.8 to the ‘Low—b” with a delta E of 4.9. The average standard deviation in-between these two sets showed an improvement from 32.8 to 6.2!
The presentation went into depth about how this data was collected, how variables were controlled for, and how the data was analyzed, and it showed convincingly that despite the high variability of current work flows, the UV Innovations UV-Grey card and Target-UV standards in conjunction with standardization of UV source and filtration can markedly improve the image variability of UV-FL photography.
One variable in “extra-spectral” imaging that was not addressed in this talk were the spatial inhomogeneities of the light source, or the gradient that results from the use of an inconsistent light source. This could be especially problematic if using UV-FL photography for condition imaging, and “flat-fielding” should be considered as a possible augmentation to the ideal image-acquisition protocol.
There is still further research to be done before this product hits the market. A fourth intensity level will be added to increase the flexibility of the product. The current prototype features two intensity levels on the front and two on the back. Notably, artificial aging must be done to determine when the product should be replaced. As this current standard only operates over UV-A and UV-B, UV Innovations looks forward to developing a UV-C standard, as well as a larger format target.
The prototype of the Target-UV and UV-Grey cards were handmade, but the company hopes to overcome the challenges of large-scale production and distribution by Fall 2014.
42nd Annual Meeting – Paintings (Joint with Wooden Artifacts), May 31, “Painted Totem Poles at the American Museum of Natural History: Treatment Challenges and Solutions” by Samantha Alderson, Judith Levinson, Gabrielle Tieu, and Karl Knauer
Those who have beheld the Hall of Northwest Coast Indians at the American Museum of Natural History and its extraordinary “totem poles” will instantly recognize the potential scope of any study or treatment of such massive artifacts.
These objects are housed in the earliest wing of the museum, curated at its inception by Franz Boas, “the father of American Anthropology”, who organized the early acquisitions of the museum according to a revolutionary argument: that of “cultural relativism” in opposition to a chauvinistic, social-Darwinist organization that put “primitive” peoples at the bottom of an evolutionary tree, the pinnacle of which was white America. Today, this hall holds a landmarked status and remains relatively unchanged, as the poles are very hard to move.
Ten years ago, a renovation of the hall was proposed. Although the recession thwarted plans, the objects were still in need of stabilization and aesthetic improvements. Because this project—from its inception, through the research, testing, and execution stage, was so expansive—Samantha Alderson reminded her audience that her talk could only represent an overview of a four-year process. Those interested in a specific aspect of the project can look forward to in-depth, forthcoming publications.
One of the more important aspects of the research phase, and a professional obligation that is indispensable to the curation and conservation of native materials, was the consideration of ethical issues and provenance information. Most of these pieces entered the collection between the 1880s and the 1920s, and the majority has been on continual, open display since their arrival. Their presence in AMNH’s collection is widely acknowledged to be ethically complicated in itself, representing an era of unscrupulous dealing in Northwest Coast artifacts. (To read more about “Indians and about their procurable culture,” consult Douglas Cole’s, “Captured Heritage: The Scramble for Northwest Coast Artifacts,” about the coincidence of a taste for these native artifacts and the establishment of many of the country’s foremost natural history collections. (p.xi)]
The carvings, including the carved columns most commonly described as ”totem poles,” would have had numerous functions within their originating cultures: house frontal poles holding entry portals to buildings, interior house posts, welcome figures, memorial poles, and mortuary posts [For a technical study on these types of carvings, please consult “Melissa H. Carr. “A Conservation Perspective on Wooden Carvings of the Pacific Northwest Coast.” Wooden Artifacts Group Postprints. 1993.].
To further hone their understanding of provenance, the 2009 CCI “Caring for Totem Poles” workshop in Alert, Canada, allowed the authors to travel through British Columbia with curatorial consultants, native carvers, and native caretakers, in order to study the techniques of manufacture. It was also important to keep abreast of the expectations of the native communities that might be borne out over the course of any treatment intervention or re-installation campaign.
The original aim of this project was to provide structural stability to those carvings which exhibited highly deteriorated surfaces caused by the weathering and biodeterioration in their original environment. These instabilities were often exacerbated by inappropriate environmental conditions and restoration interventions in the museum. The most significant issue requiring treatment was the presence of wood rot, insects, and biological growth, present in the original environment and continuing to run their course.
Although climate control was installed in 1995, soot from the age of coal heaters and lamps still blanketed the inaccessible areas of the objects. Dust from visitor traffic also dulled them, as the hall is adjacent to the entrance to the IMAX theatre. Routine and well-intentioned cleaning was ineffective against a century of accumulated grime and dust and was causing surface loss.
As there is no barrier between the objects and the visitor, touching has caused burnishing and scratching. The unfinished wood readily absorbs skin oils; and graffiti and adhered chewing gum had also become a most-unfortunate problem.
Early interventions after acquisition had caused condition problems of their own, as old fills had a hardness or density that is inappropriate for soft, weathered wood. These fill materials were only becoming more ugly, unstable, crumbly, and cracked with age.
All of these factors, taken together, provided a huge impetus for treatment.
To begin the treatment-planning stage, the conservators at AMNH performed examinations under visible and UV radiation and mapped the observed conditions and materials using a streamlined iPad-based documentation protocol. In some cases the restoration materials observed provided evidence of institutional and condition history. Although there were almost no previous treatment records of these objects, comparison with archival photographs of many of the objects showed the rate of deterioration since acquisition and provided clues as to dates of interventions and installation history.
In summary of the object-treatment stage, vacuums and sponges were first used in an attempt to reduce some of the dinginess of the surface and to increase the legibility of the painted designs. The many resinous and waxy coatings had trapped so much dust, however, that this treatment did not always have a satisfactory result.
The question of solvent toxicity held sway in all aspects of treatment, as operations were completed in makeshift spaces outside of the lab, due to the size of the objects; these areas had no fume-extraction infrastructure. Luckily, plaster fills could be softened with a warm-water-and-ethanol mixture and carved out.
Butvar B-98 and Paraloid B-72 were selected as potential consolidants and adhesives. A 5-10% Butvar B-98 solution in ethanol (i.e. without the toluene component for safety concerns) was used for surface stabilization, and Paraloid B-72 in acetone was used for adhesion of splinters and detached fragments.
Fills were designed using different materials depending on the location on the object. These were intended to reduce damage during installation, display, and regular maintenance. If the fill was not visible, shapes were cut from Volara, beveled, and adhered in place with Paraloid B-72 along the edges. These were often necessary on the tops of the poles to cover the deep voids of deteriorated wood. Some losses were back-filled with tinted glass micro-balloon mixtures of different grades and different resin-to-balloon ratios where appropriate. As some paints were solvent-sensitive, certain fills required the use of Paraloid B-67. The final fill type was a removable epoxy-bulked fill to compensate for deep losses in visible areas. These areas were first filled with polyethylene foam to prevent the fill from locking in. The edges of the fill area to be cast were protected by tamping down teflon (plumber’s) tape which conforms nicely to the wooden surface. West System 105 Epoxy Resin—with “fast” 205, “slow” 206, or “extra-slow” 209 hardeners—was used in different proportions to 3M glass microspheres and pigments to give fill material with various hardness, curing-times, textures, and colors (See Knauer’s upcoming publication in ICOM-CC Warsaw 2013 for more details). This method is notable for its invisibility, its reversibility, and its rejection of phenolic micro-balloons, which are an unstable and unsuitable and were historically used for such a wood fill merely for their brown color. Once cured, the bulked-epoxy (and the plumber’s tape) were removed and the fills were then tacked into place with B-72 to produce an aesthetically pleasing and protective cap.
Many losses which were previously filled were left unfilled, as would have been the case it they had been collected and treated today. Crack fills were incised so as to retain the appearance of a (smaller) crack.
Once the surface and structure was stabilized with the consolidation and filling operations, the team turned their attention to the various paint films to be cleaned. Many of these were proteinaceous but some were more similar to house paints. This data was consistent with the ethnographic findings and with current native practice. No preparatory layers were used, and the pigment layers were often very lean.
PLM, XRF, and SEM-EDS, as well as UV-FL imaging, thin sections, and analysis with FTIR was undertaken. Some binder analysis was also possible, but this was complicated by historical treatments. Interpretation of epi-fluorescence microscopy results was also thwarted by the presence of multiple coatings, the inter-penetration, -dissolution, and bleed-through of layers. As many as four different types of coatings were identified, and understanding and addressing the condition issues caused by these coatings became a primary concern. Cellulose Nitrate was often applied to carvings in the early 20th century. Whether this was to refurbish or protect, it has developed into a dark-brown layer which is alternately hazy and glossy and which obscured the original surface appearance. Lower regions evidenced PVA or PVAc on top of the Cellulose Nitrate. Shellac and dammar are present in isolated locations, as is an orange resin which eluded identification (even when analyzed with GCMS).
Although identification of these coatings was attempted, removal was not originally planned due to the difficulties designing a solvent system for its reduction, considering the variation in sensitivities, the interpenetration of the layers, and the unknown condition of the original paint films beneath. This plan changed when the poles were deinstalled for construction.
The treatment design was largely aided by the isolation of four house posts in the collection made by Kwakwaka’wakw artist Arthur Shaughnessy.
Commissioned by AMNH in 1923, these had never been installed outdoors but which had been coated in the same manner and exhibited in the same space. This allowed for the development of controlled methods for coating reduction.
A Teas table (or Teas chart) was used to identify potential solvents or solvent mixtures, which were tested over every color and monitored for any leaching or swelling. These initial tests were deemed unsuccessful.
In areas without paint, film reformation with acetone reduced haziness or glossiness. Where the coating was completely removed, the wood was often left with an over-cleaned appearance which necessitated some coating redistribution with MBK, MEK, and propylene glycol. Wherever possible, gels were used to reduce the exposure to toxic solvents. In painted areas, the large variation in solvent sensitivity, the inconsistency of media binders, the varying porosity of the wood, and the changing direction of the wood grain required that the conservators work inch-by-inch. DMSO, a component of “safe” stripper, and NMP were controllable over certain colors but caused considerable swelling.
February 2012, the museum saw the reinstallation of the Shaughnessy poles, marking the effective conclusion of the testing period and the successful management of a challenging triage situation by conservation staff.
It was Kwakwaka‘wakw artists like Arthur Shaughnessy who kept carving traditions active when the Canadian government prohibited the potlatch ceremony in 1885. The ban was lifted in 1951, after AMNH’s acquisition of the house posts.
The completion of treatment represents an important opportunity to educate the public: Although these monumental carvings are exhibited in a historic wing of the museum, we need to dust them off and remember that these carvings represent very, active traditional practices and communities.
There is still the need to develop more systematic solvent strategies, as well as to consult with a paintings conservator. But it is clear that these objects stand to look much improved after the grime and coatings are removed or reduced and the objects are thoughtfully reintegrated with a well-designed fill system. Thanks to the remarkable talents of the AMNH team, these stately creations are finally commanding the respect they deserve.
___
Resources:
Hall of Northwest Coast Indians :: AMNH
From the Bench: These Face Lifts Require Heavy Lifting :: IMLS
Arthur Shaughnessy house post carvings reinstalled following conservation treatment (February 2012) :: AMNH
Changing Approaches to the Conservation of Northwest Coast Totem Poles :: Reed College
Andrew Todd (1998). “Painted Memory, Painted Totems,” In Dorge, Valerie and F. Carey Howlett (eds.), Painted Wood: History and Conservation (pp. 400-411). Proceedings of a symposium organized by the Wooden Artifacts Group of the American Institute for Conservation of Historic and Artistic Works and the Foundation of the AIC, Colonial Williamsburg Foundation, 1994. Los Angeles: J. Paul Getty Trust.
A Brief History of the Jesup North Pacific Expedition :: AMNH
42nd Annual Meeting – Book and Paper, 42nd Annual Meeting, Book and Paper Session, May 29, "Treasure from the Bog: The Faddan More Psalter" by John Gillis
John shared with us his particular torment, a project that has occupied him daily for over six years, a highly deteriorated psalter uncovered from a peat bog in 2006. He still has his sense of humor, even though he freely admitted the project was pretty nightmarish at times. The psalter was uncovered from a commercial peat bog in July of 2006. Research suggests that the sphagnum moss in these bogs is what helps organic material survive so much better there than in regular soil, as the moss has a tanning effect on the organic material.
Once the psalter was uncovered, work stopped in order to rescue the fragile book. The psalter was covered in a wet layer of peat, then silicone Mylar and finally cellocast resin bandages were wrapped over the psalter to keep it wet until help arrived. This was exactly the right thing for the bog excavators to do. These men were not archaeologists or conservators themselves, but they knew what to do to keep it stable until conservators could arrive due to extensive museum outreach in the area. Local museums have provided a lot of training in order to help protect the wealth of archaeological materials located in Ireland’s bogs – most of which are commercially owned. Back at the lab in Dublin, the manuscript was kept wet and cold – at 40°C in a walk-in fridge. The media hyperbolically reported the discovery of the Psalter as being an apocalyptic omen due to a misidentification of one of the psalms. Really, psalters like this were used by monastic novices to learn their bible.
John’s first goal was to establish a collation map of the psalter. This usually easy task took two years due to the extensive trauma to the book. The psalter has five quires, 60 folios, no flyleaves, and it does not follow the insular nor the continental tradition of orienting the hair and flesh sides of the parchment folios. As John said, it seems to be “in the best Irish tradition, of completely ad hoc”.
Using a grid system, John mapped out each chunk of parchment before putting it through the drying process. He used a database to compile the veritable mountains of information the treatment of the Psalter generated. They cleaned the manuscript with water, removing thousands and thousands of seed pods with tweezers. One of the most challenging parts of the project was the “letter fishing” the group had to go through, to snag words and letters and letter-bits out of the bog. The tanning agents in the iron gall ink tanned the vellum so that frequently words or letters… or letter-parts would survive when the rest of the inner manuscript did not. In general, the inner portion of the manuscript was more likely to dissolve than the outer edges, which were exposed the tanning elements of the bog, would be preserved.
After cleaning, the Psalter page fragments underwent hyper spectral scanning, which John and his team undertook in an effort to read some of the illegible areas of the manuscript. After scanning, the fragments were ready to be dried.
The process that creates vellum creates a lot of tension in the material, and that tension shows itself most dramatically when drying wet vellum…. in intense shrinking and warp. John’s talk mostly focused on the de-watering of the vellum. Using some old historical vellum flyleaves the he had laying around the lab, John recreated putrefied vellum on which to test various drying methods. He and his crew kept track of changes in color, size and flexibility. After months of testing, they decided to proceed with a solvent bath of alcohol. They needed to restrain the vellum while it dried to minimize dimensional changes. The solvent exchange took place in a vacuum sealed bag that exerted even pressure against the entire fragment. This neatly solved the problem of restraining fragile vellum.
The National Museum of Ireland has a page devoted to the Faddan More Psalter project, with the full report on the psalter freely available.
42nd Annual Meeting – Engaging Communities in Collection Care Session: “Current Conservation Education and Practice: Are They Sustainable?”
The topic of sustainability was on everyone’s minds at the AIC 42nd Annual Meeting, and an evaluation of the sustainability of our own profession and its educational path was part of the program. Having recently crossed the threshold into an art conservation graduate program, I was particularly interested in hearing Paul Himmelstein, a private practice conservator and partner at Appelbaum & Himmelstein since 1972, assess the sustainability of such programs.
Recap:
In order to better understand how the graduate programs have changed over time, Himmelstein opened his talk with summaries of answers to a questionnaire he had distributed to the nine members of the Association of North American Graduate Programs in the Conservation of Cultural Property (ANAGPIC). From the responses collected, he reported the following:
– Most applicants today are female, compared to earlier ratios of applicants, who were closer to 50% female and 50% male.
– The requirements for admission have increased, both in the number of required pre-program hours of conservation experience and in the number of pre-requisite courses.
– All programs require two years of General Chemistry and Organic Chemistry.
– All programs are cost-free regardless of need.
– Most applicants apply twice before acceptance.
– Approximately 80 students apply per year.
– The number of accepted students in each program has remained the same.
Himmelstein attributed these changes to a list of reasons. He surmised that the decreased number of male applicants is a result of the increased number of academic requirements and pre-program hours of experience. Men, he said, are more deterred by the extra years needed to complete these requirements as they are still driven by the “provider” mentality. He also noted that AIC is currently 66% female, but the majority of conservation leadership positions at major fine-arts institutions are held by men. He also pointed out that the majority of our demographic is white and middle-class. In response to the full-ride fellowships, Himmelstein predicted that the expense of supporting all students every year is not sustainable, given the number of students accepted.
Himmelstein continued by offering a list of proposed solutions. He suggested considering changing the grants to a need-based system. He also suggested adopting an admissions approach that simply rejects or accepts with no option for reapplying, as in medical schools and law schools. He also added that more men are entering the field of nursing, another female-dominated profession, as a counterpoint to the fact that our profession is losing men.
After stating that 50% of AIC members are in private practice, he advocated for a business-management component at the graduate level, in which conservators in private practice could share their experiences and provide mentorship at the post-graduate level. He said that new graduates “just aren’t ready” to begin careers in private practice. He also advocated for Kress scholarships for textbooks.
His solutions list continued to broaden outside the graduate school realm and included general suggestions for advocacy and outreach. According to Himmelstein, “Met[ropolitan Museum of Art] conservation projects are boring” and “conservation is hidden.” He feels that conservators are not working as important colleagues with other museum professionals; they also need to play a larger role in the fields of art history and archeology. He suggested presenting conservation treatment projects online, as in plastic surgery “before” and “after” shots. Viewers could scroll over the artifacts to watch them change. Himmelstein suggested that the public “expects us to be wizards,”and concluded with the statement, “We are not on a sustainable track, but I think we can be.”
Response:
Assessing the sustainability of our profession, especially in our current economic climate, is imperative. I agree that we must reexamine the number of students graduating each year to reduce expenses and to help control the job market, but not by selectively limiting funding or reducing a person’s chances for acceptance. Limiting funding at the graduate level would create an impossible financial position for most students. The demands of graduate school are such that no one is able, or even allowed, to work while in school. Unless a student is independently wealthy, then everyone falls into the “needs funding” category. According to Himmelstein’s report, average conservation students are not independently wealthy. Many internships at the graduate level are also still unpaid or partially paid, and students rely on their stipends to compensate. The current post-graduate income can also not sustain significant student loans. The “one strike you’re out” formula is also flawed. Many talented individuals who have made great contributions to our profession would not have become conservators if they did not get another chance to apply. Those who reapply show tenacity and dedication and our profession is shaped by those who participate.
I believe the decrease in male applicants is related to other factors and not because of the program requirements. Nursing is likely attracting more men because it has lost some of the “stigma” of a woman’s profession along with providing a relatively secure and well-paying job market. Conservation wages have fallen over time and the number of men in the field are likely reflecting this trend. In another life I pursued a degree in nursing and can attest that the increase in the number of men is not because less time is needed to get in to school. On the contrary, regardless of whether a student works to earn a bachelor of science in nursing or an associates degree in nursing, many hours of volunteer experience are required and many programs now require that a student become a certified nursing assistant before admission. This certification takes two months of full-time work or six months of part-time work in order to qualify for the state board exams. This work, in addition to the pre-requisites needed to apply, takes most individuals at least one year before they can apply to a nursing program. Some of the struggles we fight in conservation are not unique, but we are feeling the growing pains of a smaller and much newer profession, one that needs continuous advocacy in order to earn a living wage.
I agree that continuous outreach, both to the public and to colleagues in the humanities and sciences, is essential. Himmelstein touched on disseminating information to appropriate departments within schools. This is a particularly important task for me as a current graduate student, and a great way to continue advocacy for our profession. I was made fully aware of how important it can be to connect with other graduate students in the two weeks that followed AIC. From June 2-13, three classmates and I participated in the Delaware Public Humanities Institute (DelPHI). Applications to the course were open to all University of Delaware graduate students who work with material culture. Those two weeks were packed full of learning important skills such as navigating social media and presenting your project with concise and interesting language, and investigating what inter-departmental collaboration could mean for each of our disciplines. Plans to attend one another’s lectures and to share our research in one another’s classrooms are already underway for the 2014-2015 school year. I would like to hear other examples of these types of collaborations, because I am sure other wonderful ideas are being implemented.
The sustainability of art conservation is indeed an important discussion and I hope it is one in which conservators at all stages of their careers will participate.
AIC’s 42nd Annual Meeting – Opening Session, May 29, “Sustainable Collections Care on a Budget – A new museum store for Bolton, UK” by Pierrette Squires
With her excellent talk, British conservator Pierrette Squires showed that it is possible to do a major collections move project while still being economically and environmentally conscientious. Of course, doing so required an enormous amount of careful planning, creativity, and hard work, which Squires outlined.
Situated in northwest England, an area hard hit by the recession, the Bolton Library and Museum Services (http://www.boltonmuseums.org.uk/) sold the textile mill which previously housed its collections storage. The staff then had to move and rehouse the collection of over 40,000 objects, ranging from fluid specimens to industrial machines, to a new location in two years and with a tight budget of $1.4 million. A large part of the success of the project resulted from the conservation team being included from almost the very beginning. Because of their involvement, the move was inspired by the green values of “Reduce, Reuse, and Recycle,” values which contributed not only to environmental sustainability but economic sustainability as well.
The location chosen for the new collections storage was another old factory. Despite some pollution and asbestos, the building was in good shape structurally. Working closely with the mechanical engineers, the museum did careful environmental monitoring of the space. The museum made the unorthodox decision not to install air conditioning, which would be expensive, but instead to use large amounts of insulation. Other green features of the building renovation included the installation of solar power panels and of Power Perfectors (voltage optimization devices), which save money by buffering energy draw. Adjustments like these resulted in a 50% reduction in energy costs.
Less expensive alternatives for outfitting the storage area were also sought out. Rather than using an expensive system designed for museums, cheaper compact storage intended for use in other industries was selected. Used metal racks and wooden pallets were chosen for storage of larger objects. In all, 65% of the storage furniture was second hand, saving money and keeping things out of landfills.
The arrangement of collections within the storage area was also carefully planned to maximize the environmental conditions of the building. For example, more stable objects like geological specimens were placed in areas against exterior walls, while textiles and archaeological materials were placed in areas farther away from the loading dock and thus most protected from temperature and humidity swings. Fluid preserved specimens were placed in the northern and thus cooler part of the building.
The actual move of the collection continued the theme of sustainability. Local transport companies were hired to do the actual moving, which saved on gas and contributed to the local economy. Storage and packing materials were reused as often as possible. When no longer usuable, materials were recycled.
In conclusion, the move was a very successful project. Although not all the choices made in the project are applicable to every museum – one wonders about the risk of pollutants from used and wooden storage furniture, the ideas presented in this talk were interesting and thought-provoking. The talk proved that environmental sustainability and economic sustainability are not opposites but can go hand in hand.
42nd Annual Meeting – Research & Technical Studies Session, 29 May, "A Closer Look at Early Italian Panel Paintings Session: Imaging Cross-sectional Paint Samples from the Walters Art Museum" by Zachary Voras, Kristin de Ghetaldi, Tom Beebe Jr., Eric Gordon, Karen French, Pamela Betts, Glenn Gates
A problem encountered in the study of paintings is distinguishing the medium in which they were created, and delineating layers which may include different media of mixtures of media. This was the subject of a paper presented at the Research and Technical Studies session.
It is not easily possible to distinguish between oil paintings and tempera (egg-based) paintings by eye, or using many analytical methods. The authors discussed the benefits and drawbacks to three main types of analysis that are used within paintings conservation: cross-sectioning, Fourier-Transform Infrared (FTIR) spectroscopy, and thin layer chromatography (TLC). FTIR, for example, cannot distinguish between egg proteins and glue, and the results can be masked by pigments or colorants. None of these methods, as discussed, can be definitive when it comes to mixtures of media such as tempera grassa.
The author also considered the effectiveness of other common methods, such as GC/MS (Gas Chromatography – Mass Spectrometry). The main drawback to this is that results cannot be compared across different experiments if the methodology varies even slightly.
The combination of these drawbacks in common methodologies led the authors to pursue Time of Flight Secondary Ion Mass Spectrometry (ToF-SIMS), a high-resolution technique that is better at separating and identifying fragments which are different but have similar masses. It also allows for the presence of specific compounds to be ‘mapped’, giving a helpful visual of layers and levels. Using this method, they were able to map for amino acids, identifying the presence of animal glue in a mixture. Practically, this was shown to differentiate between a gesso-size ground and the glue layer which was determined to have been purposefully added.
The talk concluded with a reminder that this technology, as with most, works best in conjunction with other methodologies. While this is an important point to remember, the potentials of this technique are exciting. I’m very interested to see the potential that this technique has for three-dimensional objects with multiple painted or gilded layers. I hope that someone pursues this, and that the technique is able to be harnessed across conservation disciplines.