Homogeneous single-part photographic color developing concentrate and method of making

Concentré homogène en une seule partie pour révélateur photographique en couleur et méthode de préparation

Photographisches einteiliges homogenes Farbentwicklerkonzentrat und Herstellungsmethode


A method of preparing a homogeneous, ready to use, sulfate-free, single-part color developing composition comprises the steps of: A) mixing in water, a color developing agent present as a sulfate salt, an antioxidant for the color developing agent, alkali metal ions in at least stoichiometric proportion to the sulfate salt, and a water-miscible or water-soluble, straight-chain organic solvent having a molecular weight of from 50 to 200, and present at a concentration such that the weight ratio of water to the solvent is from 15:85 to 50:50, to form an alkali metal sulfate in the solution, and B) removing the alkali metal sulfate from the solution.




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Patent Citations (3)

    Publication numberPublication dateAssigneeTitle
    EP-0603586-A1June 29, 1994ILFORD LimitedSolution de développement photographique
    EP-0762199-A1March 12, 1997Kodak-Pathe, Eastman Kodak CompanyConcentrated solution for colour photographic development
    JP-H10333302-ADecember 18, 1998Chiyuugai Shashin Yakuhin Kk, 中外写真薬品株式会社Color developing solution for silver halide color photographic sensitive material

NO-Patent Citations (1)

    DATABASE WPI Derwent Publications Ltd., London, GB; AN 1999-110257, XP002130333

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