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Natural-color photography (1906)
König, E. (Ernst), 1869-1924, author · London : Dawbarn & Ward, Ltd., publisher of "Utility" books, 6 Farrindon Avenue, E.C. · leaf 46
Red. Orange. Yellow. Green. Blue. Violet. … SPECTKUM TESTS, TO SHOW ACTION OF VARIOUS DYES. . Ordinary plate. 2. Erythrosine -bathed plate. 3. Ethyl-red bathed plate. 4. Orthochrom-bathed plate. 5. Pinachrome-bathed plate. 6. Pinacyanol-bathed plate. 41Color photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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