Peiyuan Sun's Internship Highlights
Hi, I am Peiyuan Sun (锫瑗 孙). I am a graduate student at the Conservation Center, Institute of Fine Arts, NYU. I have been working as a Conservation Fellow under the supervision of Preventive Conservator Jessica Pace at the Barbara Goldsmith Preservation & Conservation Department of NYU Libraries since September 2022. Upon completion of my internship in June, I will graduate with an M.A. in Art History and M.S. in Conservation of Historic and Artistic Works. In other words, by the time you see this Tumblr post, I will have finished my four-year-long studies and work! I am really grateful for working in the Department. In this Tumblr post, I will review the highlights of the past 9 months and 22 days.
Setting up a polarizing light microscope
My first mission was to build a LEICA polarizing light microscope from parts and modules. I was a little surprised at first. I had used microscopes but I had never had to build one worth thousands of dollars. And there were two manuals because the microscope would be made with parts from two different models: the stage and illuminator were from DM750 P, and the reflected light unit was DM750 M. It turned out to be straightforward and only took me and Jessica a morning to put everything together (fig. 1).
Figure 1. Me and the microscope.
The next challenge was to write instructions for beginner microscopists because both LEICA manuals assumed that their users are microscopists. To make sure that the instructions are clear to beginners in microscopy, I compiled my notes into 29 pages of step-by-step instructions with many color illustrations. The manual was printed and kept with the microscope in a binder. Not a professional microscopist myself, I found this exercise inspiring, pointing me to the large body of knowledge in microscopy that was still waiting for me to explore.
The microscope can be used in the material identification of fibers, pigments, and other particles. While other recent developments in analytical technologies made polarized light microscopy seem so primitive, a polarizing light microscope is still a beloved, simple, and powerful tool for conservators. Sometimes identification dictates how people should handle an object. For example, blue asbestos fibers are characterized by their needle-like appearance and pale blue birefringence color under transmitted cross-polarized light (fig. 2). While asbestos is an obsolete fill material with health hazard issues, they can surprisingly show up in a collection. If the fibers are loose on an object, the people handling it should take extra precautions to prevent inhaling the fibers (wearing personal protection equipment such as gloves, mask, goggles, and lab coat).
Figure 2. Blue asbestos fibers under transmitted crossed-polarized light.
Kathe Burkhard’s “Gold Fan”
The first object to treat was a painted and gilded paper folding fan made by Kathe Burkhard (1958–), an American painter, writer, and art critic. The fan is covered in gold-colored metal leaves and thick layers of transparent resin which hardened and froze the fan in its open position. Burkhard transformed a cheap paper fan into a gold fan glimmering in thick coatings that look like honey-colored amber. She wrote in white paint “truths” on the one side, and “Lies” on the other side (fig. 3).
Figure 3. The “Gold Fan” before treatment.
The fan had several issues when it came to the care of the Department. The fan’s paper leaves were torn and its gold-colored metal leaves were peeling off the paper (fig. 4). The surface was also covered with dust and grime that darkened colors.
Figure 4. Details of the torn paper fan before treatment.
With the goal to stabilize the fan and improve its appearance, we decided to close the fractures, put down the lifted metal leaves, and reduce the surface dust and grime. I used wheat starch paste to adhere to the torn edges, and I used small strong magnets to press the joints together while the starch paste dried and cured. Adhering a small part each time, I worked along each fracture, and back and forth between the two sides to make sure things align correctly. There was one tear that went along a fold line of the fan. The two sides of the tear had little overlap for adhesion, like the two halves of a malfunctioned lifted bridge. I used a strip of Japanese paper coated with starch paste and a synthetic adhesive called methylcellulose to mend this tear––now I put an extra bridge over the broken one to hold the two sides together.
I introduced gelatin solution as an adhesive to reattach the leaves to the paper. And after the leaves were secured, I used dry pre-washed cosmetic sponges to clean the surface. I cut my sponges into tiny wedges so that I can maneuver a small piece between and over fragile metal leaves. After the treatment, the fan’s paper structure was more stable, and its surface recovered some of its past glitter (fig. 5 & 6).
Figure 5. Details of the torn area after treatment.
Figure 6. The “Gold Fan” after treatment.
Rehousing objects from the David Wojnarowicz Papers MSS.092
Organizing objects crowded in a box can give conservators headaches. When I opened “box 139”, I did not know how many objects were there. It was only after taking a documenting photograph, I realized that 28 objects were crammed into one archival box (fig. 7). They are made of various materials, including metal, plastic, fabric, stone, and glass. These random things were collected by American artist David Wojnarowicz (1954–1992). Some were used as props for his photographs. For example, I noticed that a clock face, “object 092.2.0492”, with Roman numbers might be featured in his 1988 photo Untitled (Time/Money) in the Ant Series (fig. 8).
My mission is to identify the plastic objects and separate them from the rest of the objects. Apart from visual observation, I used Fourier-transform infrared spectroscopy (FTIR) to analyze materials that are suspected to be plastic. This analysis can be used as a non-destructive method. The object’s material of interest could be clamped down against the analysis window on the stage to gain data (fig. 9). Yet not all objects could be fitted onto the stage. Because the machine was intended for industrial use, where samples are usually in powder (such as drugs), the space between the stage and the built-in clamp is limited. The analysis also requires that the surface of the object be pressed against the window on the stage. The pressure can also leave tiny impression marks on some objects due to the clamping. So while the analysis may be non-destructive, it might damage the object.
Though identifying plastics with FTIR was fun, the most interesting part for me was driving a polyester encapsulation system with an ultrasonic generator and motor control. The instrument allowed me to create 35 small Mylar pockets custom-made for the objects. “Object 092.2.0504” consists of small charms (34 metal pendants and 1 feather). Before rehousing, they were stuffed in a small bag made of bubble wrap and brown pressure-sensitive tapes. After rehousing, each charm was snuggly fitted in its pocket (fig. 10). A visitor can easily see both sides of the charms by handling the Mylar sleeves.
Figure 7. Objects from the David Wojnarowicz Papers.
Figure 8. David Wojnarowicz. 1988. Untitled (Time + Money). Photographs. Gelatin silver print on paper.
Figure 9. FTIR analysis of a scarecrow candy container manufactured by the E. Rosen Company at Rosbro Plastics in the 1950s. The cardboard was added to support bigger objects on the stage.
Figure 10. Charms rehoused in Mylar pockets.
Conservation of Balinese Shadow Puppets in the Mabou Mines Archive MSS 133.
I first knew about the project of the shadow puppets from my supervisor Jessica on September 23rd, 2022. I thought it would be another rehousing project. I did not know that I would study, research, and work on the puppets till the last day of my internship. The project included research, artist interviews, treatment, and rehousing.
The 40 shadow puppets (133.2.0023 through 133.2.0053) were mostly made for MahabharANTa, written by Lee Breuer and performed in 1992 in the United States. The story is a battle between the animals and insects on the White House lawn. The puppets are flat shapes attached to wooden and bamboo handles. 6 puppets were made of paper materials, and the rest were made of painted rawhide. Balinese shadow puppet master (dalang in Balinese) I Wayan Wija made all the rawhide puppets in Bali. The puppets have fragile paints that needed consolidation. They also needed rehousing because they were originally sandwiched in flimsy paper folders and piled in two boxes.
If you are interested to learn more about his project, a recording of my presentation on the project is available through this link. Here, I want to tell you some things that are not in the treatment reports or my presentation.
An episode before everything began was taking the documentation photos of the puppets, some of which measure 26 to 28 inches long, and some have multiple moveable arms, jaws, and even antennae. Photographing colorful objects could be hard for the background color must be right. I first opted for black, the default color of the background paper already set up in the photo room. I soon realized that many puppets have black parts and all of them have dark outlines, which happily blended in with the black background. Then I tried neutral grey, a color that conservators love. The issue was that a similar grey was used on the puppets. The grey areas can be mistaken for hollow places (fig. 11). Finally, I decided to use white as my background. There was no white background paper in the photo room. Fortunately, there are plenty of white things in a book and paper conservation lab. I used a large piece of Artcare foam core as my white background (fig. 12). I regretted that I did not try different colors against just one puppet at the beginning, but caused extra handling of all puppets. Bits of paint did come off when I moved puppets around. This was a lesson learned hard.
Figure 11. Before treatment photo of the “chariot” shadow puppet against neutral grey.
Figure 12. Before treatment photo of the “chariot” shadow puppet against white.
Though I started on the project in 2022, I did not treat the rawhide puppets until 2023. Jessica and I did research into the puppets because the finding aid provided inadequate information, missing the artist and date, and whether the paper and rawhide puppets were made for the same performance. So in 2022, I treated and rehoused the paper puppets while learning about Balinese shadow puppets. Jessica and I did archival research in the Mabou Mines archives, and we found that the puppets were all made for the same performance. Two names came up as the designers of the puppets, Larry Reed and I Wayan Wija. We contact Larry Reed who told us that I Wayan Wija made all the puppets. Pak Wija lives in Bali. Our first few emails ended with no responses. When we were thinking that we would never find him, I found, on the website of the Smithsonian National Museum of Asian Art, an article on Balinese shadow puppet theater by Professor Lisa Gold. She met with Pak Wija and featured him in her article. I emailed her and she provided me with Pak Wija’s contact information. In February, Jessica and I interviewed Pak Wija on Whatsapp.
While the research slowed down the progress, we were grateful that we did not skip it. We learned that the Balinese puppets have sacred entities beyond their physical materials. Balinese puppets were alive in performances, needed to be fed and paid respect, and have the healing power to help people in return.
As conservators, we had limited power beyond taking care of the physical materials; Not a Balinese shadow master, or dalang, I could not take care of the spiritual parts of these puppets that I could not see or touch. According to Balinese traditions, untrained hands were not even allowed to handle sacred puppets. But Jessica and I were proud of our work. I think what we tried to do was to restore the connection between objects and people, giving back the puppets their identities and meanings. I think getting to know them is a starting point for paying the puppets the respect that is overdue so that others can do better in the future. The bond between the puppets and the people would have been lost in time and the dark storage rooms if we did not bring the puppets to Conservation.
The greatest challenge was the consolidation. To stabilize the paints, I fed an isinglass solution into detached paints to stick them back down and to hold tiny flaked paint pieces together. I chose to treat the “chariot” puppet as a trial. It took me a month to finish it. At that time, I had less than 5 months left and 29 puppets to treat and rehouse. Plus, the old stock of isinglass was running out, and I had to extract a new batch to carry on.
So finally I told Jessica, “I don’t think I can treat all the puppets.”
But the puppets might not have the chance to be treated again with enough space, time, and budget. Jessica and my colleagues said I should give it a try. The whole book and paper lab helped in making the new batch of isinglass. Jessica and I agreed that I would treat the most unstable ones as our priority. So that even if I could not treat every single puppet, the ones left would be relatively stable.
I used a Leica microscope to guide the consolidation. Examining the parts that need treatment under powerful magnification allows me to grasp the microstructures of unstable paints and find out a strategy for approaching each situation. Some look like colorful tents, volcanoes, cliffs, and archipelagoes. I found myself diminishing in size, taking a walk in these landscapes. Strangely, with the pressing deadlines, I did not feel like a desperate traveler in a hurry to get to a destination, but more like an explorer on a joyful journey.
When the final month approached, Jessica and I decided to rehouse all puppets and finish their reports before I carry out more treatment. I cut archival blue boards and cut them into the sizes of the boxes. And I attached soft Volara foam blocks as bumpers to hold the puppets in place. And Ethafoam blocks were added to the board so trays could be stacked in a box without pressing on the puppets.
Before we wrap up, Jessica and I met with Weatherly Stephan (Head of Archival Collections management) and Nicholas Martin (Curator for the Arts and Humanities) to share my research findings so that information regarding the maker, date, and correct names of the puppets can be incorporated into the finding aid. For the housing information to be updated and to facilitate clarifying “what went where”, I created a Google document with an illustrated rehousing scheme for reference. Jessica will also keep the research information, including the artists’ contacts, for future reference.
I ended with all the puppets rehoused with their own reports. Of the 37 treated puppets, 30 were consolidated. There are 3 puppets left to treat, but the amount of work required should be minimum.
I am grateful for working with so many kind and professional people during the past months. I want to give my special thanks to my supervisor Jessica Pace. Jessica helped me better understand the priorities of different tasks. This project is in debt to her patient guidance, communication, and foresight. You can also find out more about the people at NYU Libraries through the staff directory.
I want to thank any patient Tumblr reader who read thus far. If you are eager for getting into Conservation, please find out more at the Emerging Conservation Professionals Network. You are also welcome to contact me via email [email protected]. I am happy to talk about my experience and projects, or just discuss random nerdy things in Conservation.