History of color photography (1945)

Page scan 000384 from History of color photography

Record Details:

Title:
History of color photography
Date:
1945
Publisher:
Boston, The American photographic publishing company
Volume:
History of color photography
Leaf #:
000384
Language:
English
Subjects:
Color photography -- History, Color photography
Collection:
Books
Format:
Books
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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PRIMARY COLOR DEVELOPMENT 371 A red color can be formed if indigo white be replaced with the sulphuric ester of the leuco compound 6:6' di-brom-di-methyl-bis-thio-naphthene-indigo. Yellow is formed from an ester of the leuco derivative of helindon yellow. The fact that substances such as 4-methoxy-alpha-naphthol, and 2:6-dimethoxy-phenol OH OCH3 are developers, yielding dyes whose structures are the following: 0 o OCH3 QCHa O.CHa QCH3 O\ZD> — >°=<!_)>=^_)> 0'CH3 OtH3 0'CH3 H 0'CH3 OtH gives rise to the possibility that it may be possible to make other developers that cannot form quinone imide structures by oxidation, but form, rather, an indigoid type of structure. Since para methoxy-phenol is not a developer, whereas the di-methoxy compound is; and since alpha naphthol is not a developer, but para-methoxy-alpha-naphthol is; the inference may be drawn that in heavy molecules the structural requirements for the presence of developer power are different from what they are in the simpler compounds. It is well known, for instance, that phloroglucinol HO cannot act as a developer, but that tri-methyl-phloroglucinol is a developer. Also it is well established that resorcin does not reduce exposed silver halide grains, but tri-methyl resorcin