Blue photographic prints employing light-sensitive iron salts, most commonly on paper; introduced in the 1840s but not in general use until after 1880; often used as proofs.
Broader Terms
Monochromatic works (8),
Photographic prints (17)
Narrower Terms
Blueprints (8)
Related Terms
Proofs (2)
This record is part of the Thesaurus for Graphic Materials I: Subject Terms (TGM) compiled by the Prints and Photographs Division, Library of Congress. more>