History of color photography (1945)

Page scan 000380 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 #:
000380
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 OH I-O o R is any aryl group O£H Orange or red dyes are obtained if acylamino groups are the substitutions. Examples of this are: OH 2 : 5-benzoyl amino-hy droquinone 2-benzoyl amino1 : 4-dioxy-naphthalene The presence of an azo group in a molecule evidently does not affect the developing properties, for the deep blue sodium salt solution of 4-phenyl-azoi : 2-dioxy-naphthalene can act in the capacity, yielding at the same time a lemon-yellow dye image. This substance has the structure: and can be formed by coupling benzene diazonium chloride with i:2-dioxy naphthalene. The generators of the lignone dyes can act as primary color developers. Several instances of these have already been mentioned. The symmetrical di-methoxy-pyrogallol is one, and 4-methoxy-alpha-naphthol is another. The beta-methoxy-alpha-naphthol gives a purplish red, beta-phenyl-alpha-naphthol a purple, and tetra-methoxy-alpha-naphthol a blue. Substituted ortho-amino-phenols and naphthols are again mentioned (Eng. P. 498871). A yellow image is obtained from 3 : 5-dimethyl-2-amino-phenol. The corresponding di-chloro, bromo, and cyano derivatives can also be used. Ortho-amino-meta-brom-cresol gives reddish-yellow images, as does orthoamino-para-xylenol. Rose to purple colors can be had using alkoxy orthoamino-phenols, alpha-phenyl-amino-beta naphthol, or beta-phenyl-amino-alpha-naphthol. OH -OR R is an alkyl group