Process for the preparation of a solid adduct of sulfuric acid and urea
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United States of America Patent
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Nov 7, 1989
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N/A
app pub date -
Sep 12, 1988
filing date -
Feb 22, 1980
priority date (Note) -
Expired
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Abstract
A method for processing exposed and developed photographic silver dye-bleach materials, in which the exposed and developed material is treated with aqueous bleaching preparations which contain (a) an acid component, (b) a silver complexing agent, (c) one or more bleach catalysts, (d) optionally an antioxidant, (e) optionally a water-soluble oxidizing agent and (f) optionally a bleaching accelerator. A water-soluble and as a rule solid adduct of an acid amide or a lactam and a strong mineral acid is used as acid component (a).
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