AIC’s 40th Annual Meeting, Joint Sessions: Objects + Reseach and Technical Studies, May 9, Some Unusual, Hidden, Surprising or Forgotten Sources of (Possible) Sulfur Contamination in Museums and Historic Buildings

Presenter: Paul Benson

Sulfur is well known as an agent of deterioration associated with atmospheric pollution, but sulfur was, and still is, intentionally introduced into buildings as part of the construction process, and is a part of some objects in museum collections. This presentation by Paul Benson was tremendously informative about how sulfur may be hiding in plain sight and damaging collections.  The talk provided examples of the use of sulfur past and present, and provided an example of effective control of sulfur used in the construction of an exhibition space.

Molten sulfur is an excellent electrical insulator. It has very good adhesive, handling, and casting properties that make it a good fill material. It goes through a flexible stage when cooling and it expands slightly (3%) on setting. In the US plaster ceilings were repaired with molten sulfur until the 1920s and buildings built before 1940 may have sulfur behind the surface of the walls as an insulator or fill material.   Conservators carrying out CAP surveys should be mindful of these possibilities.

There are unsuspected modern uses of sulfur as well. Used as an inexpensive filler in Chinese-manufactured dry wall imported to the US between 2001 and 2009, it caused extensive damage and reconstruction. Sulfur with additives is used instead of Portland cement in Canada because it has considerable shorter set time.

The Nelson-Atkins Museum discovered that the cause of severe mottling of bronze sculptures was sulfur applied behind the  numerous travertine sides of display cases integrated into the structure of the walls.  This situation was successful remediated by removing each piece of travertine, and applying  Marvelseal® with Beva®.

Sulfur has been used as a fill material in bombs. Police forensics use sulfur to take very accurate casts of footprints in snow.  These objects may be stored for long periods of time and contaminating other evidence.

Molten sulfur has been used since antiquity as an adhesive.  Pliny may have described its use as an adhesive for glass (depending on the translation). Sulfur was used as an adhesive in Rome, Greece, and Byzantium. All stones in the Thetford treasure at the British Museum were set with sulfur.  Sulfur was used to secure iron rods holding together elements of stone sculpture.

Sulfur can be found as an inlay material in furniture marquetry particularly in the sixty years from 1760 forward.  Sulfur will take on the appearance of mother of pearl with repeated heat treatments and can be found as “pearl” inlay on guns and  guitars.

Objects may be made of sulfur. “Spences Metal” is an iron-sulfur alloy used in the years around 1880. It can take a high polish and imitate a variety of metals. At the time hoped to be in inexpensive replace for bronze. “Ebonite” was made of rubber with 30-40% sulfur and was used to manufacture buttons and casters for furniture among other utilitarian objects that may be in museums of attached to objects in a collection.

Sulfur has been found in an historic clock cast around the weight to hold it in place. The “lead”  of German pencils made before 1770 is a combination of graphite mixed with sulfur. Coins may have been cast in sulfur lined plaster casts.  And among the seemingly innocent items that might be in a conservation lab sulfur is present in Plasticine® and pencil erasers.

This presentation provided a useful warning about possible contamination from sulfur present in unpredictable places and provided a wide range of examples to guide in hunting for an unseen source of corrosion.

AIC’s 40th Annual Meeting, Objects Session, May 11, 2012, Always Becoming, Nora Naranjo-Morse, Gail Joice, Kelly McHugh.

“Always Becoming”, an outdoor sculpture installation at the National Museum of American Indian (NMAI), was the focus of the presentation by Artist Nora Naranjo-Morse, NMAI Collections Manager Gail Joice and NMAI Conservator Kelly McHugh.  Like the work of art “Always Becoming”, this presentation was engaging, thoughtful and inspiring.

Nora Naranjo-Morse, a member of the Tewa tribe, Santa Clara Pueblo, won the NMAI outdoor sculpture competition in 2007.  Nora Naranjo-Morse lives only a few hours from Albuquerque and was a welcome artist addition to the objects conservation talks of the day.  Her creative and welcoming personality was apparent through out the presentation, as it is her artwork.  The outdoor installation “Always Becoming” consists of five ephemeral sculptures made of straw, mud, stone and wood built on a landscaped area near NMAI.  The creation of the sculptures started a ten year project that will continue to grow and transform for years to come.  The design of artwork is based on indigenous architecture and has the ideas of environment, family and culture at its core.

A one hour long documentary movie on this project will be coming out in the summer 2012, and we were lucky enough to see a few clips from it during the presentation.  The movie clips clearly showed how the creation of this artwork was a truly inclusive project with NMAI staff members and interns working along side Nora Naranjo-Morse during the construction and subsequent yearly repairs.  Interviews with passersby, workers and volunteers made it touchingly clear that the whole process was a moving one.  The movie clip stated that the project was “not just a pueblo idea, it was an intertribal idea, it was a people idea” and this feeling of inclusiveness was apparent in the movie interviews as well as in the presentation.  Many NMAI podcasts are available, if you want to see clips of the creative process.

“Always Becoming” is an ever-changing artwork that is intended to melt back into the earth.  The artwork is always deteriorating naturally as it weathers the DC snow and thunderstorms, summer heat and the passage of time.  This is an idea that does not immediately correlate with conservation standards, but it was extremely clear that NMAI has worked through this initial change in conservation practice.  Through continual communication and yearly visits by the artist, the conservation department at NMAI has been able to work past the automatic reaction to preserve and protect.  By allowing the sculptures to change over time they are in fact protecting the original and continual intent of the artist.

Gail Joice is the Collections Manager at the NMAI Museum.  It is her job to monitor the adobe sculptures onsite.  Gail made the enlightening comment about how her work with these artifacts has pushed the bounds of her thoughts on objects care.  Before this project the ideal for a condition report was to be able to state “no change”, a statement that all of the conservators in the audience clearly understand, but to Nora Naranjo-Morse this would be a disappointment.  Change is built into the life of these artifacts.  If a piece falls off of the sculptures, it will be left where it falls without any picking it up, labeling it and placing it in a fragment bag (Obviously a collections managers first impulse!).  The question session after the presentation clarified that these fallen pieces are often reincorporated into the sculpture during the yearly conservation workshop when the artist returns to work on the pieces.

The sculptures have been a welcoming addition to the grounds of NMAI.  Not only do the visitors and passersby appreciate the installation, but red tail hawks, mason bees, spiders, and a mother robin have all made their homes in the sculptures.  One story they told occurred right before President Obama’s inauguration.  The nighttime security at the museum noticed flames coming out from under one of the sculptures and it became quickly apparent that a homeless man had crawled underneath the sculpture and had lit a fire to warm up.  The museum officers responded quickly and the fire was extinguished, but the artist’s and NMAI staffs’ reactions to this are not what the conservation audience would have predicted.  This was not seen as an act of vandalism, but instead it was seen as a man needing to find shelter in the cold and he had found the artwork welcoming and inviting as it was intended.  It was a thoughtful and reflective moment in the audience when this was described.

Kelly McHugh is the NMAI conservator that is involved in Nora Naranjo-Morse’s annual visits and sculpture care workshops with the NMAI conservation interns and fellows.  Kelly was able to sum up all of the main points of the presentation and clearly put them into a conservation context.  As Kelly stated, “Always Becoming” is a contemporary sculpture, a traditional sculpture, a community sculpture and an ephemeral sculpture.  Nora Naranjo-Morse’s intention of inclusiveness, community importance and sculptural interaction with the environment fits perfectly into the framework and mission of NMAI.  Kelly made a comparison between a spider on an outdoor bronze sculpture versus one living on “Always Becoming” that struck home with the conservators in the room.  She said that a spider on a museum bronze sculpture would be seen as an invader and need to be removed, where as a spider coming to live on “Always Becoming” would be welcomed and would have found his home.

The question session after the presentation ran late, but this only served to make it clear how engaged the audience was in the presentation.  The questions clarified further the process that takes place when the artist comes on her annual visits.  Essentially the NMAI staff follows her lead and assists her in ways that she sees fit, whether that is cutting back weakened bamboo to be sent to the horticultural department’s compost or reworking a delaminating section of the sculpture.   Scott Carrlee asked about whether the artwork is accessioned into the NMAI collection and Gail answered that yes each of the sculptures has a number and is accessioned into the collection.  She thought that once the sculpture has returned entirely to the earth that there may be a ceremonial deaccessioning of the piece.  This seems like a very fitting course of action.

I could write pages on this presentation, because it was interesting, informative and thought provoking.  The audience was engaged in each of the speaker’s presentations which all worked together to give a full and clear picture of this project.  As Kelly pointed out, “Always Becoming” continues to inspire them into always becoming something better.  We, the world, and conservation is always changing and the NMAI staff and Artist Nora Naranjo-Morse clearly shared a project that had us all thinking about the ways that our profession has changed and needs to change in order to fit the future.  This was a truly enjoyable and valuable talk.

40th Annual Meeting, Textiles Session, May 10, A Cautionary Tale: Mounting Flat Textiles – An Historical Overview, Christine Giuntini

Christine Giuntini gave a wonderful paper on the mounting of flat textiles in the mid 20th Century. The paper was in a way a tribute to the Textile Museum in Washington, DC and the quality work that they did to set the standards for textile conservation in the United States. The paper is based on the historic mounting methods presented in two articles that were published by the Textile Museum in the 1940s and 1950s. These two methods are the stitched mount and the pressure mount.

Conservation publications and focus today have moved away from the intense focus on complicated individual treatments in favor of overall storage and preventative conservation. When we do research and comment on early conservation treatments today, it is often due to the troubles that older materials and techniques have caused in retreatment. We have to remember that there is still a lot that we can learn from older treatments and conservation theory.

The Textile Museum in Washington, DC was the real center for beginnings of textile conservation in the United States. The museum opened in 1925 and was open by appointment only until the 1950s. The museum was founded by George Hewitt Myers was created for the preservation, study and display of historic textiles.

Mr. Myers was very interested in cleaning of the textiles and went so far as to say that patina on textiles is a synonym for dirt. He also felt that the dirt should be removed because it did not logically improve the art. One of the publications that Christine Giuntini highlighted in her presentation was “Cleaning and Mounting Procedures For Wool Textiles” written by Francina S. Greene, Preparator and Curator at the Textile Museum. (This article is available as a pdf at http://www.cs.arizona.edu/patterns/weaving/monographs/tm_work.pdf). Like Myers, Francina Greene was very conscience of the dirt on the artifacts and begins this article with “When ancient textiles are acquired they are often dirty, distorted, dry, dull in color and ragged. In addition to being dirty, many are stiff with grease, and stained. We find that some reveal crude attempts at cleaning, patching and mounting.” This publication emphasizes a number of textile conservation methodologies that are still used today. The textiles in the Textile museum were handled as little as possible due to their fragile condition. The flipping technique of sandwiching the textile between two rigid supports in order to turn it over is described. This technique is still used today. When stitching a textile to a support as few stitches as possible were taken due to the damage that they cause to the artifact. Lastly, Greene also described the pressure mount technique of mounting a textile by sandwiching it between two pieces of plexiglass. The Textile Museum used a number of cellulose acetate products (Protectoid and then Lumarith) as they were developed. Today cellulose acetate is not used in conservation or exhibition, but the practice of using a clear rigid support is still used despite the fact that the specific materials have changed.

The second publication by Mrs. Francina Greene was published in Studies in Conservation volume 2 and is titled, “The Cleaning and Mounting of a Large Wool Tapestry.” This article was the first detailed conservation treatment to appear in Studies in Conservation. There is a great picture in this article that speaks a thousand words. The image shows one conservator on top of a large tapestry stand and one conservator below the stand passing a needle back and forth through the tapestry. This treatment was a reconstruction of a very fragile and friable textile. Photographs were taken to scale of all of the textile fragments and the photographs were rearranged in order to determine the proper arrangement so the textile would be spared the extra handling. Greene also notes that curved needles were not used for this treatment, because of the stress they caused on the fragile fabric. This is why two conservators had to pass the needle back and forth to each other.

The death of Mr. Myers and the retirement of Mrs. Greene in the 1950s brought about a time of transition at the Textile Museum. In 1964 the Textile Museum started the first textile conservation training and internship program in the United States. They worked with a Chemist consultant in order to collaborate on cleaning methods. They created solid composite backings with perforations for better air exchange and the reversed mount was developed. One of the important students in this program was Nobuko Kajitani, who went on to work at the newly established textile conservation program at the Metropolitan Museum of Art in 1973. Nobuko developed the use of a window in the back of the peg board mounts and worked to develop the pressure mount for fragile textiles. Her focus was on the overall care of the collection and not on publishing individual conservation treatments. Nobuko was the first to emphasize that a conservation plan was of great importance. In a 1974 article she wrote, “Preservation of collections is a primary function of a museum… sound planning and preservation fitted to the requirements of the collection in exhibition, storage and study areas should be discussed and understood.” This is obviously a primary focus of the conservation world today. It is clear that the Textile Museum staff and the textile conservators trained in their educational program laid the foundation for the textile conservation program in the United States today.

During the question portion of the presentation a suggestion arose that Christine Giuntini should work with the conservators at the Textile Museum to further research the role that the Textile Museum played in creating the groundwork for the profession today. I think that this would be an excellent paper and hope that they decide to collaborate in this project.

AIC’s 40th Annual Meeting, Wooden Artifacts Sesssion-The Edge in Focus: the Many Stories of an 18th c. French Frame Treatment by MaryJo Lelyveld

I’ve been following MaryJo Lelyveld’s work with interest for while now. In addition to working a conservator of frames and furniture at the National Gallery of Victoria, she is pursuing a Masters of Management (Strategic Foresight) at Swinbourne University. Based on one of her articles, I’ve added Plextol B500 in my arsenal of options for adhesives I use for replacement gilding, and I’ve told more than a few people about her work looking at possible scenarios for the future of the conservation profession.

In this talk, MaryJo applied a framework called Integral Theory to help navigate the various ways help articulate object values and understand our audience’s perspective on our work, using her work on a carved and gilded French frame made in 1710 for The Crossing of the Red Sea by Nicolas Poussin, c. 1634. [A  short tirade digression: Note that in this ArtDaily.org article celebrating the restoration of the painting and frame which even quotes MaryJo about her work, the frame was not included in the image. There is an image of the framed painting on the National Gallery of Victoria’s homepage.]

Integral Theory, as developed by Ken Wilber, uses a 4 block grid system, similar to the one Barbara Appelbaum uses for her Characterization Grid which maps various values as they apply to artifacts to assist in developing proposals for conservation treatment, and likewise provides a systematic overview of a complex practice. In MaryJo’s rendering of Wilber’s grid for conservation practice, each quadrant relates to a particular viewpoint, the personal, the physical, the cultural, and social as they relate to the conservator, the artifact, and the audience. The graphic nature of the grid, I think, is really important in explaining this as applied to conservation, and without one of her examples I’m afraid I won’t be able to explain it well here. I look forward to seeing her work on this topic published.

She pointed out that each single quadrant only provides a single perspective, a partial truth. By navigating the viewpoints, the grid enhances a conservator’s ability to combine these partial truths to gain a fuller understanding of the object and its place in society and explain its importance and why it might merit conservation treatment.

AIC’s 40th Annual Meeting – Objects Session, May 11, “Always Becoming” by Nora Naranjo-Morse, Gail Joyce, and Kelly McHugh

The last talk of the Objects Specialty Group session focused on the work of Nora Naranjo-Morse, a Tewa Indian of Santa Clara Pueblo who was selected from a nationwide contest to design a composition for display outside the National Museum of the American Indian (NMAI). In 2007, her idea for five sculptures, ephemeral in nature, came to fruition on the NMAI grounds, entitled “Always Becoming.” The three speakers shared their ongoing experiences regarding their collaboration in this talk, representing artist, collections management, and conservation.

It was Nora’s intention to embody in the sculpture the significance of three main values held by Pueblo families: environment, family, and culture. However, she took a unique approach by engaging community in both the creation and stewardship of the sculptures, and in doing so, highlighted the idea of an intertribal ideal. The ideal was manifested in the cooperation of members of the public, as well as staff at NMAI, who all came together to build the artworks. A series of podcasts as well as YouTube videos (Episode 1) document their collaborative effort under her guidance.

The figures vary in form and materials, comprised of mud, fired pottery sherds, wood, and straw, and other organic materials. Her choices are especially relevant given that Nora’s desire was to allow the sculptures to ultimately return to the earth, promoting stewardship, but not preservation in the sense that conservators typically understand it. The role of nature in shaping their condition and form is welcomed as a part of the process of “Always Becoming.” Weather plays an expectedly large role in the formative processes, and is reflected by the layered structure of the sculptures; as one layer melts away, another is revealed, a process that Nora appreciates in person as she travels to NMAI on annual visits. The return of the materials to the earth is also represented by the re-use of elements. For example, ground up sherds of fired pottery, or grog, were mixed into some of the mud. However, the idea of returning to the earth does not preclude the replacement of all elements. When a bamboo rope used to represent a tie at the top of the teepee form disintegrated, it was decided to replace it with strips of rawhide, offered by a staff-member at NMAI. In this way, intertribal community was also promoted, and the sculptural form maintained what Nora considered a crucial element. This promotion was also clear given the numerous phone updates, dialogues, and discussions that occurred between Nora and the staff over the course of the year when she was not present.

Gail then discussed her experiences in participating from a collections management perspective. She noted the role of human interaction in shaping the sculptures as well, citing an example whereby a homeless gentleman took up short-lived residence in the teepee after carving out a small shelter during a particularly inclement evening. While the sight of smoke and flame was certainly alarming, however brief and quickly addressed by NMAI security, Gail juxtaposed her own reaction with Nora’s, who appreciated that someone considered her work a warm and welcoming shelter. Gail proposed that the idea of the sculpture as a living document and testament to nature, nurture, and conceptual art is often at odds with the traditional museum approach to preservation. Even if roles were re-envisioned, however, a balance was reached whereby all parties contributed. For example, pieces of pottery or memory stones that fell off were to be left; on the other hand, fired ceramic moons, as they represented part of a sequence, were to be sent back to Nora to re-create. A locust wood and rawhide fence was constructed to keep children from climbing on the sculptures and the surrounding plants from being trampled. Gail highlighted the influence of animal interaction with a few examples: mason bees drilling holes into one of the figures, and a robin’s nest in the Y-post of another.

Kelly spoke about her involvement when she took the place of a previous staff-member in 2009, after the construction, focusing on the ongoing role of conservation in the project. She stressed the admirable qualities of Nora’s vision, including community inclusion, the interaction of the sculptures with people and the environment, the importance of materials, but most of all, engagement with both the public and NMAI staff. This point was especially relevant and well-received, given that the AIC Annual Conference theme this year is Outreach. NMAI conservators became more comfortable with the idea of deterioration and the expectation of it, though preservation by creation, through deterioration, is not typically a part of our approach. Kelly suggested that the project prompts a discussion regarding alteration of materials, wherein some ambiguity currently exists. She illustrated this point by noting use of the term “time-based media” to refer to many digital and performance arts, where change is accepted and expected as part of the life of the artwork, and effecting an appropriate conservation approach. She suggests that this very idea is just as appropriate and more useful for sculptural projects such as “Always Becoming,” which is, eponymously, in a constant flux. In conclusion, she expressed gratitude at being given the freedom to experience change, and urges other conservators to be open to similar experiences.

40th Annual Meeting, Wooden Artifacts Session, May 11 “Training the Next Generation of Furniture Conservators”, Mark Anderson, Steve Brown, MaryJo Lelyveld, Jonathon Thornton, Antoine Wilmering, Debbie Hess Norris, Moderator

This was a panel discussion moderated by Debbie Hess Norris on where the future of furniture conservation training lies. WAG Program Chair Stephanie Auffret began the discussion by describing the current situation, in which very few students are being trained in furniture conservation in the US currently. In preparation for the discussion, Stephanie sent a questionnaire to the panel participants, current educators in furniture conservation, and current practicing furniture conservators. The questionnaire asked about expectations of core competencies for recent graduates in furniture conservation, opportunities to develop these competencies, and where potential employment opportunities for recent graduates might lie. The questionnaire identified a broad range of core competencies which a recent graduate in furniture conservation ought to have, including knowledge of the history of furniture, a scientific understanding of wood and other materials used in furniture making, good hand skills, knowledge of preventive conservation and documentation, as well as a structural understanding of furniture.

The panelists then gave very brief presentations. Steve Brown, professor of furniture making at the North Bennet Street School in Boston, MA, described the furniture training program, which includes knowledge and handling of hand and power tools, and a progressive series of furniture making projects, including a tool chest, a chair, a table and a case piece. He showed typical examples of furniture made by NBSC students, and described the emphasis of the program on developing hand skills.

MayJo Lelyveld described the absence of furniture conservation training opportunities in Australia, and described how most conservators tasked with caring for furniture there have come from othher areas of specialization and have had to develop their skills on their own, or from non-conservators with knowledge of woodworking techniques. For treatments involving a high level of woodworking skill, they have to turn to these non-conservators to participate in the treatment.

Mark Anderson then briefly talked about the furniture major at WUDPAC, describing how few majors there have been in recent years. WUDPAC requires that its furniture majors demonstrate a certain level of competency in wood working, a requirement that does not exist for any of the other majors. WUDPAC has graduated very few furniture majors since this requirement was instituted, illustrating that it is very difficult to assemble all the prerequisites at a sufficiently high level of achievement to get in to Winterthur and also gain experience in cabinet making.

Ton Wilmering talked about some of the training programs in Europe, and that they exist at more varied academic levels, briefly discussing his own training.

Jonathon Thornton talked about the Buffalo program, indicating that they train furniture conservators their as well. He emphasized that good hand skills were important for ALL conservators, and that developing them in one area or another could come a little later in a conservator’s training.

Debbie then opened the discussion up to the floor, and my ability to take careful notes took a back seat to my interest in the conversation. The following is more my impressions of the conversation than a strict recounting. Tad Fallon pointed out that the first CAL class occupied many of the institutional positions that are still available, and that the institutional job opportunities haven’t been that great. Jonathon Thornton said it’s like the pig in the python (or something like that), a big bulge in the middle, but it’s skinny at both ends! Steve Brown said that a visitor to NBSS once commented that she wished she had a job which didn’t require any thinking, illustrating an attitude about furniture making which is all too prevalent (sometimes even among other conservators, and especially other museum professionals, in my opinion).

The discussion seemed to center more and more around whether and how much training in furniture making a furniture conservator needs. Jonathon Thornton pointed out that furniture conservators have a host of tools, techniques and materials available to them not typically used by the traditional furniture maker, including casting in polymers and digital reproductions, which conservators do and should use. Ton Wilmering related the discussion back to the wood panels of panel paintings. He described that many museums (and conservators) accept cracks in panel paintings when they would never accept tears in easel paintings. He thinks this is because the conservators responsible for the panel know they don’t have the wood working skills to repair the crack.

Mark Anderson again discussed Winterthur’s difficulty in finding students with the preparation necessary to get in to the program and the woodworking skills necessary to major in furniture, and suggested that students didn’t need to arrive at Winterthur with those skills, nor did they need to go to NBSS to get them. There was some discussion from the floor that areas of subspecialization (marquetry, carving, etc) are not usually perfected by even those students who DO have wood working skills before they get into school. Others pointed out that much of the work done by most furniture conservators involves surface treatment rather than structural work. I believe a largely unspoken, but underlying current in the discussion, was that there are not a large number of institutional jobs in furniture conservation in existence in the US right now. Mark did say that an institutional job was the ambition of most conservation program students. This may be part of the problem in recruiting students into furniture conservation, but the problem will only compound itself when current institutional furniture conservators retire and their institutions are unable to find people trained to replace them. The positions will be eliminated and there will be even fewer jobs available, and more furniture collections will be in the care of people without the training to undertake complex treatments.

Debbie wrapped up the discussion by suggesting that WAG needs to plan a way forward. She had a wide-ranging list of suggestions. Perhaps WUDPAC could send potential furniture majors to NBSS for the summer between their first and second year, as they are currently doing with some book and paper majors to the NBSS bookbinding program (an idea which occurred to me as well during the discussion). WAG might undertake demographic studies about where furniture conservation positions exist, and how close those in those positions are to retirement. The data collected could be used to help develop grant proposals to improve the professional development opportunities for various woodworking skills. She encouraged discussions between WAG and FAIC to work on developing more PD courses. She also suggested that WAG hold a roundtable discussion among furniture conservation educators, both US and international, to discuss current practices and how things might be developed, and how job opportunities might be increased. She offered that WUDPAC and Winterthur would be willing to host such a discussion. Debbie being Debbie, she left us all feeling hopeful for the future, with a renewed sense of purpose and willingness to roll up our sleeves and get cracking. Let’s hope we can build some momentum and accomplish some of the things on Debbie’s list of suggestions.

40th Annual Meeting, Objects Session, May 11th, “The Treatment of a Mi’kmaq Box Made of Birchbark, Porcupine Quills, and Iron-Dyed Spruceroot”, Carole Dignard

The multi-step treatment of a Mi’kmaq birchbark box was outlined in this talk presented by Season Tse. The circular box with four stacks of rings is made of birchbark and decorated with dyed spruceroot and porcupine quills. Before treatment, it was exhibiting significant instability due to a deformation of the lid, the separation of the rim from the lid, and localized deterioration of the dark brown dyed spruceroot. There were also reported losses in the birchbark, unknown instability of dye components to light, losses to the spruceroot, and overall surface dirt.

The treatment began with a cleaning of the quillwork with saliva. This step revealed the brilliance of the blue-dyed quillwork and the presence of yellow-dyed quillwork previously unnoticed. The sensitivity of the dyes to light damage was tested using microfade tests with a Blue Wool dye scale ranging from 1-8. The dyes were found to between 3-4, which indicates that the dyes would survive 100 years at 50 lux for 8 hours a day before noticeable fading occurred.

The lid of the box was deformed and warping. After testing using deformed samples of birchbark, they found the appropriate solvent and pressure parameters to treat the deformity. A methanol vapor chamber was used under 6 psi vacuum conditions for three days to reform the lid. The treatment was mostly successful though some springing occurred.  Broken spruceroot was stabilized, paper pulps fills were used for the loss of birchbark, and the lid was attached to the rim with Japanese tissue paper hinges.

The investigation and treatment of the dark brown colored spruceroot could be considered the highlight of the talk. Through their investigation into the colorants of the material they found that the colorant had both iron (II) ions and tannins present. This combination has been reported time and again as the source for severe deterioration of dyed cellulosic material. The concentration of iron (II) ions were identified and monitored throughout the treatment with iron indicator paper. To stabilize this deterioration they choose calcium-phytate solution, developed by CCI, to complex with the iron thus arrest the oxidation of the spruceroot material.  Because the box could not be immersed in to the solution the application was with brush. After each application the ion content was monitored. They found that five applications were enough to stabilize. However, the application of the solution was not without complications and risks. The spruceroot swelled during the application and staining of neighboring spruce root occurred due to migration of the iron ions.

 

 

 

40th Annual Meeting, Wooden Artifacts Session, May 11 “Conservation Training at the Forbidden City”, Antoine Wilmering

Ton Wilmering, Senior Program Officer at the Getty Foundation, spoke about the the World Monument Fund’s new conservation training program it has developed at the Forbidden City in Beijing, China as part of its collaborative conservation program for the Qianlong Gardens in the Forbidden City. The gardens, a series of 27 pavillions and courtyards built by the Qianlong Emperor between 1771 and 1776 within the Forbidden City are an extraordinary example of Qian Dynasty decorative arts, and reflect the emperor’s broad cultural tastes and knowledge. I had the privilege of seeing the traveling exhibition of furniture and other objects from the Qianlong Gardens at the Peabody Essex Museum in Salem, MA in 2010, and the furniture and interiors on view were beautiful, exhibiting incredible craftsmanship.

The World Monument Fund is focused on funding projects with capacity-building components, and in conjunction with their conservation program in the Qianlong Gardens, in 2009 they established an new training program in the Forbidden City known as Conservation Resources for Architectural Interiors/Furniture and Training, or CRAFT. The program is designed to provide on-the-job training in both traditional craft practices and modern conservation techniques and science. Participants were selected from among current staff members of the Forbidden City complex, and include carpenters, collections care specialists, curators, architects and scientists. Current craft practitioners in China often have little knowledge of past techniques or history, and the program was designed to introduce them to craft history using historic Chinese cabinet making manuals. The program focuses on critical thinking as well as hand skills, and areas of study include scientific principles, history of conservation ethics, worker safety, drawing and drafting using both traditional and CAD techniques, materials technology, tool making, and joinery.

The program has made efforts to include Chinese faculty wherever possible, and Chinese wood species specialists and organic and inorganic chemists have taught in the program. The WMF found that many of the resources and people needed in the program were available in Beijing (in fact lots of conservation literature has been translated into Mandarin), but the WMF needed to make the connections with local libraries and scientists to bring them into the project. Other participants in the training program have included Susan Buck (cross-section analysis), and Chris McGlinchey (adhesives), and Behrooz Salimnejad (gilding) among others, as well as Ton, Rick Kershner and Greg Landrey, who the WMF brought in initially to design a space for the program and develop the curriculum.

Ton pointed out that the furniture on view in the traveling exhibition from the Qianlong Gardens which came to the US had not been worked on by participants in the CRAFT program. Instead, the Forbidden City bureaucracy had contracted out the restoration of that furniture, and it often involved practices that conflicted with modern conservation ethics. I was interested in the cultural differences exhibited by the Chinese participants. Ton told how the students all liked to work together on a project, showing a picture of four students sitting around a table, cleaning it with swabs together.

Ton also talked about the difficulties the program has experienced. Because the participants are employees working in the Forbidden City (remember, the program is on-the-job training), they are frequently called away to their regular jobs, which can be disruptive. Continuous supervision of the program by a trained conservator has also bee difficult. Many of the original participants have had to – or have chosen to – drop out, and currently about half the original class are still participating. Interestingly, it is the carpenters and architects who have stayed, not the collections care specialists.

After talking about the CRAFT program, Ton briefly discussed another initiative the Getty Foundation is involved in, to facilitate the transfer (and retention) of skills and knowledge in the structural conservation of panel paintings. Many of the most skilled practitioners in the conservation of these wooden panels are approaching retirement age, and the Getty Foundation has begun a 6 year initiative to set up apprenticeships with these practitioners for post-graduate, mid-career and senior conservators of wooden artifacts. The program is designed to have a broad geographic distribution, to include participants in Eastern and Western Europe, as well as the US and UK, presumably.

 

AIC’s 40th Annual Meeting – Objects Session, May 11, “Made in L.A.” by Rachel Rivenc

The original topic of this talk shifted from the analysis of sculpture created by the “Finish Fetish” artists using ATR (attenuated total reflection) to a discussion of the materials and methods of fabrication employed by three of these artists: Craig Kauffman, John McCracken, and Larry Bell. Though not accepted by the artists themselves, “Finish Fetish” was a name bestowed upon a group working in the L.A. area in the 1960s referring to the cool, yet pristinely finished surfaces that were characteristic of their art. Rachel noted that care must be given to preserving the signature surfaces, thus any analytical investigations required the use of non-invasive techniques only. The materials examination was augmented by interviews with artists when possible, as well as archival documents.

Craig Kauffman, one of the first artists to use plastics in the L.A. art community, converted industrial fabrication methods into his practice. Heavily influenced by Marcel Duchamp, his early work involved painting, typically with clean lines, on the back of acrylic sheets composed of poly(methyl methacrylate), confirmed by ATR analysis. By 1964, he had begun shaping the acrylic sheets by vacuum forming, collaborating with a manufacturer. The acrylic was heated in an oven until it softened, then shaped on a mold to create shallow reliefs. Kauffman’s sketches reveal plans for fiberglass molds with wooden supports, which were especially necessary for his later experimentations with depth and complexity. The transparent shells were subsequently painted, using thick rubber masks to create crisp lines. Later, he created a feathered look by spraying the paint over a cardboard mask, which served to soften the lines. He eventually shifted from solvent-borne acrylic-based paint, an ethyl methacrylate/methyl acrylate co-polymer, to nitrocellulose paints, since the solvent-based paints caused the substrate to craze and crack.

Rachel went on to discuss the technique and materials of John McCracken, who is reported to have said he wanted his sculptures to look as if they were “made of color.” They generally consisted of wooden planks coated in a layer of fiberglass, followed by a primer and various layers of paint, later switching to polyester resin application instead of paint. To make grooves in the surface, he would mask the lines with painter’s tape, then coat exposed surface in the polyester resin mixed with pigment. He consistently jotted down ideas and sketches before producing technical drawings, and even kept a notebook recording the varying temperatures and amounts of catalyst used for the resin as he experimented, making note of how it affected the working time, as well as the properties of the resulting work. Regardless of the conditions, the application of resin to the surface of the planks required an experienced and steady hand in order to avoid the evolution of bubbles in the resin layer (as any novice conservator embedding their first few paint samples for cross-sections knows!). The final step involved sanding of the surface to a smooth sheen.

The last artist Rachel broached was Larry Bell, who worked not with plastic, but with glass. Originally a painter, he would add mirrors to his compositions to introduce volume, eventually deciding that he wanted to work exclusively with volume. He worked often with plywood, mirror parts, and paint, though he increasingly favored glass, such that his paint became instead the effect of light as it was manipulated by the glass. In 1962, he began experimenting with the vacuum deposition of thin films to the glass, soon after which he bought a secondhand machine to execute the process himself in 1966. This purchase allowed him the freedom to create larger panels, which also corresponded with a shift into more environmental art. The vacuum chamber heated the metal under vacuum to a temperature at which the metal vaporized and was deposited on the surface of the glass as a micron-thin film. The three metals most commonly used by Bell were aluminum, silicon monoxide, and nickel-chromium alloys, otherwise known as ‘Inconel.’ The thin film of metal influences the way light is reflected, refracted, and transmitted through the glass. Bell also experimented with changing the temperature and combining metals, all while monitoring the chamber through a window to assess the changes. Rachel noted that Bell, the only artist alive of the three discussed, is actively involved in the conservation of his work, providing conservators with replacement panels when they break.

The above represents but a small portion of the project embarked upon by the GCI (Getty Conservation Institute), a study of the materials and working methods of these and other artists active in the LA area during the postwar period who borrowed from modern industry. The study is a part of both the Pacific Standard Time initiative that included a recent set of exhibitions across Southern California sponsored in part by the The Getty. It also represents the GCI Modern and Contemporary Art research initiative. Future plans include a publication to disseminate the work, a short video, and an exploration of practical applications for the information gained, such as ways to mend cracked and chipped polyester and acrylic resin. Ultimately, the research of Rachel and her colleagues, Emma Richardson and Tom Learner, will hopefully help facilitate treatment decision-making for conservators working with modern and contemporary artwork.

40th Annual Meeting, Wooden Artifacts Session, May 11 “The Establishment of Collaborative Platforms in Protecting and Conserving of the Global Cultural Heritage”, Dr. Hany Hanna

Dr. Hany Hanna, who is the General Director of Conservation for the Helwan, El-Saf and Afteh Sectors of the Supreme Council of Antiquities in Egypt, delivered a general call for increased levels of attention on a local, national, regional and global scale to the protection and conservation of global heritage. While his talk did not relate to wooden artifacts specifically in any way, it was directly related to the theme of the Annual Meeting as a whole, and since Dr. Hanna specializes in the conservation of wooden objects and has spoken to our group in the past, no doubt he felt WAG was the appropriate venue for his talk this year.

Dr. Hanna began by defining cultural heritage as including both the tangible and intangible. Tangible heritage includes:

  1. Cultural
  2. Natural
  3. Cultural Landscapes
Intangible heritage includes:
  1. Practical experience
  2. Knowledge
  3. Skills
He pointed out that cultural heritage is priceless for humanity as a whole, as well as for nations and groups. It both strengthens identity within groups, as well as respect for and appreciation of other groups. Dr. Hanna discussed the fact that while great strides have been made on a global scale in protecting our global cultural heritage through education, advances in technology, and the development of new facilities and international partnerships, more must be done to protect cultural heritage form man-made and natural threats. In general, he called for more training, more investment in research and education, as well as facilities to carry out this research and training, and more international cooperation and partnerships.
At the same time, Dr. Hanna encouraged self reliance on the part of governments, NGO’s and universities in individual countries. His point seemed to be that while networking, cooperation and partnerships are vital for the preservation of global cultural heritage, local action and raising local public awareness are the most effective means of achieving preservation goals of emergency preparedness and recovery, risk and damage assessment, and reconstruction and restoration.
In general the ideas and approaches outlined by Dr. Hanna are completely in accord with the thinking of the US conservation community. But it was encouraging to hear them being expressed by a colleague from Egypt. Dr Hanna made two points which were somewhat more surprising. He called for what amounts to an international certification program, validated by local governments but defined by professional organizations, which would include measures to protect against malpractice. I for one had not heard this idea suggested before, and I’m not sure US conservators are ready to embrace such an idea, given our recent decision on a US certification program. But it may reflect the different experience of Dr Hanna in the practice of responsible conservation.
Dr. Hanna also called for the integration of cultural heritage and conservation issues with other economic sectors, suggesting that this would aid social and economic development. This seems to me to be essentially the same argument the Anne-Imelda Radice made in her address to the general session. But in discussing this, Dr. Hanna suggested that conservation training needed to be based “on every day life on a wider level”.  By this I took him to mean that conservation training needs to be related to and made relevant in the lives of the people living with the cultural heritage the training program is intended to protect. This seems an eminently sensible suggestion, and relates Dr. Hanna’s talk to the next talk in the WAG session by Ton Wilmering, discussing the World Monuments Fund’s new conservation training program in the Forbidden City in Beijing China, which I will discuss in my next blog.