G - Physics – 03 – C
Patent
G - Physics
03
C
96/215, 96/71
G03C 5/26 (2006.01) G03C 5/44 (2006.01) G03C 7/28 (2006.01)
Patent
CA 1165165
Abstract A method for processing exposed silver dye-bleach materials using novel preparations for combined dye bleaching and silver bleaching is described. In addi- tion to a strong acid, a water-soluble iodide, a water- soluble oxidising agent, an antioxidant and, if desired, a bleaching accelerator, these preparations also contain a mixture of 1,4- or 1,2-diazines as bleach catalysts. This mixture consists either of at least two bleach cata- lysts with redox potentials between +105 mV and -30 mV, the difference between the-redox potentials of the cata- lysts being at least 15 mV, or of at least one bleach catalyst with a redox potential between +60 mV and -30 mV and at least one bleach catalyst with a redox potential between -30 mV and -100 mV, the difference between the redox potentials of the catalysts likewise being at least 15 mV. When exposed dye-bleach materials are processed using these preparations, images with improved colour quality are obtained,
345316
Jan Gerald
Marthaler Max
Ag Ciba-Geigy
Gowling Lafleur Henderson Llp
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