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

Abstract

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)

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

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