The Getty Conservation Institute has developed new techniques for dating 20th century photographs, giving museums, collectors and dealers a new tool to plug holes in the forgery-ridden market for high-dollar original photographs. By analyzing traces of barium, strontium and other metals used in the chemistry at different times and by different manufacturers, it is now possible to place a specific print in it’s historic slot with precision. Researches into Asian organic colorants and antibodies in egg tempera contine.
also by Bill Davenport
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