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AUTHOR INFORMATION

JIA-SUN TSANG is a 1985 graduate of the University of Delaware/Winterthur Conservation Program. She was with the National Gallery of Art in Washington, D.C., from 1984–87 before joining the Conservation Analytical Laboratory, Smithsonian Institution, in 1988 as paintings conservator. She was a specialist in clinical chemistry at the Medical College of Ohio, Toledo, Ohio, from 1974–80. Address: Conservation Analytical Laboratory, Museum Support Center, Smithsonian Institution, Washington, D.C. 20560.

DAVID ERHARDT received his Ph.D. from the University of Maryland in 1977. He was a medical research associate at George Washington University from 1978–79 and is currently senior research chemist at the Conservation Analytical Laboratory of the Smithsonian Institution where he has been since 1979. Address: Conservation Analytical Laboratory, Museum Support Center, Smithsonian Institution, Washington, D.C. 20560.