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Friday, May 30 • 8:30am - 9:00am
(Objects + Research and Technical Studies Session) Ultraviolet Induced Visible Fluorescence and Chemical Analysis as Tools for Examining Featherwork

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Feathers are found in cultural heritage and scientific research collections of tribal arts from the Americas, Africa, and the Pacific as well as in contemporary art, European and American 18-19th century fashion, and in taxidermy and ornithology specimens. While museum conservators routinely evaluate feathers by looking at insect damage and mechanical wear, as well as fading as evidence of light exposure, examination of feathers for visible fluorescence under an ultraviolet source is atypical. Recent research by both the authors and bird biologists indicate that nondestructive ultraviolet fluorescence examination can provide valuable information about the identification and pigmentation of feathers found in museum collections, but must be used with caution as both light exposure and adventitious materials may compromise fluorescence. The authors also evaluate different methods of chemical analysis for detecting light induced chemical changes in feathers.

Recent research conducted jointly by UCLA and the Getty Conservation Institute illustrated the importance of identifying feather pigmentation systems in the design of a preventive strategy. The difference in susceptibility to fading of undyed feathers can be a tenfold dose depending on the colorant systems present in the feather and the emission spectrum of the light. Feathers with color derived from the scattering of light through small scale feather structures are known to be more light stable than feathers with coloration based on biological pigments. A number of feather pigments, including psittacofulvins found only in red and yellow pigments in birds in the Psittaciforme family, as well as porphyrins found in rusty brown owl plumage, may be identified by their specific ultraviolet induced visible fluorescence. The Psittaciforme family includes culturally significant birds such as parrots and macaws and cockatoos, whose plumage comprises not only red and yellow feathers but also green feathers colored by mixtures of structural colors and psittacofulvins.

Feathers that are not directly fluorescent may still undergo appearance changes under an ultraviolet source as a consequence of light aging. Such changes are not readily measured colorimetrically as they may result in chemical and not appearance changes. The authors will describe a variety of analytical techniques applied to light aged feather samples in order to present the most sensitive methods for detecting chemical changes that parallel fluorescence changes.

Speaker(s)
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Melissa Hughs

Graduate Student, UCLA
avatar for Ellen J. Pearlstein

Ellen J. Pearlstein

Associate Professor, Information Studies and the UCLA/Getty Program in the Conservation of Ethnographic and Archaeological Materials, University of Los Angeles, California
Ellen Pearlstein has an MA in art history and archaeology from Columbia University, USA; and an Advanced Certificate in conservation from the Conservation Center of the Institute of Fine Arts, New York University, USA, specializing in archaeological and ethnographic objects. Ellen was the first L.W. Frohlich Fellow in objects conservation, Metropolitan Museum of Art, USA, in 1982-1983, studying fatty patinas on African wood sculpture. She was... Read More →

Co-Author(s)
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Christel Pesme

Museum Lighting related to conservation issues Consultant - Paper conservator, Freelance
Christel Pesme is a private paper conservator and consultant for preventive conservation issues related to museum lighting. Her research interests have surrounded the development of museum lighting best practices for displaying sensitive collection artifacts, including the routine use and further refinement of the MFT as a light-sensitivity assessment tool. She is a MFTesting provider for cultural institution and also offers training on how to... Read More →
JM

Joy Mazurek

Assistant Scientist, Getty Conservation Institute
Joy Mazurek has worked as an Assistant Scientist at the Getty Conservation Institute since 1998.  She specializes in the identification of organic materials by gas chromatography/mass spectrometry.  She obtained her master’s degree in biology, with emphasis in microbiology from California State University Northridge, and a bachelor of science degree in biology from University of California, Davis.
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Molly Gleeson

Project Conservator, University of Pennsylvania Museum of Archaeology and Anthropology
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Renee Riedler

Conservator, Weltmuseum Wien


Friday May 30, 2014 8:30am - 9:00am
Bayview A-B

Attendees (109)