Radiation imagery chemistry: process – composition – or product th – Post imaging processing – Developing
Patent
1989-05-23
1990-12-04
Schilling, Richard L.
Radiation imagery chemistry: process, composition, or product th
Post imaging processing
Developing
430447, 430464, 430467, 430484, 430485, 430490, 430491, 430607, G03C 730, G03C 726
Patent
active
049753576
ABSTRACT:
Hydroxylamine compounds are commonly included in photographic color developing solutions to retard aerial oxidation. When the photographic element processed in the color developing solution is one which contains an aromatic polyhydroxy compound which serves as a stabilizing addendum, there will be a build-up of the level of such compound in the developing solution as seasoning occurs. Also, as a consequence of seasoning, there is a gradual build-up of the level of trace metal impurities in the solution. Interaction of a trace metal impurity with the aromatic polyhydroxy compound can form a metal-complex which catalyzes the oxidation of the hydroxylamine compound and thereby renders it ineffective for its intended purpose. In the improved method of this invention, the color developing solution is protected against the unwanted metal-complex catalyzed oxidation by incorporation therein of an aminopolycarboxylic acid sequestering agent.
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Buongiorne Jean M.
Huston Janet M.
Schwartz Paul A.
Vincent Sheridan E.
Doody Patrick A.
Eastman Kodak Company
Lorenzo Alfred P.
Schilling Richard L.
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