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Tuesday, May 17 • 11:45am - 12:00pm
(Objects) The Use of Gums and Resins in Archaeology and Microchemical Tests for their Identification

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A survey of approximately 150 artifacts with resinous materials or residues at the Arizona State Museum were characterized using multiple techniques including UV examination, micro-chemical tests, and Fourier transform infrared spectroscopy (FTIR). A special focus was placed on micro-chemical testing, which is an invaluable tool in conservation as often analytical instrumentation is not available. Especially useful was a reevaluation of the o-toluidine test, which can distinguish between gum/mucilage and starch. A new test was developed to confirm the presence of unprocessed lac based on the color change of dyes in the resin in the presence of alkali. The study identified problems encountered with each technique that may lead to misidentification. As part of a Save America’s Treasure Grant, basketry, sandals, wood artifacts, bows, arrows, textiles, cordage, vegetal artifacts, and botanical specimens representing 2000 years in the US Southwest were identified. Those with resinous material were selected for further examination and analysis. The peoples of the southwest used a variety of organic materials including pine resin, plant carbohydrates such as mesquite gum and mucilage prepared from cacti flesh and roots, and creosote lac (a resin exuded from the insect Laccifer larrea that is similar in composition to shellac). This study found that resinous materials are often misidentified and the terminology is inconsistent in the archaeological, ethnological and ethnobotanical literature. Consequently, museum records are often erroneous. Results from the collaborative work of conservators and conservation scientists identified regional differences in the use of various gums and resins. These differences reflect different environmental regions. Also, there is evidence that cultural groups within the regions utilized and processed resinous materials in different ways possibly reflecting cultural traditions or trade.

avatar for Christina Bisulca

Christina Bisulca

Research Specialist, Arizona State Museum
CHRISTINA BISULCA has a BA in chemistry and art history (Rutgers University, 1999), a MS in objects conservation (Winterthur/ University of Delaware Program in Art Conservation, 2005), and a PhD in Materials Science and Engineering as part of the program in Heritage Conservation Science (University of Arizona, 2014). She specializes in conservation science and the conservation of ethnographic and natural science collections. She is currently a... Read More →
avatar for Marilen Pool

Marilen Pool

Project Conservator, Arizona State Museum
MARILEN POOL, PAAIC, is a Project Conservator for the Save Americas Treasure’s Basketry Project at the Arizona State Museum, University of Arizona. She received an MA in Museum Studies from Oregon State University and a Diploma in Conservation from Sir Sandford Fleming College.

Tuesday May 17, 2016 11:45am - 12:00pm
Room 710 B

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