Radiation imagery chemistry: process – composition – or product th – Color imaging process – Using identified radiation sensitive composition in the...
Patent
1980-02-04
1981-12-08
Downey, Mary F.
Radiation imagery chemistry: process, composition, or product th
Color imaging process
Using identified radiation sensitive composition in the...
430393, 430462, G03C 700
Patent
active
043048463
ABSTRACT:
A method for processing exposed silver dye-bleach materials using novel preparations for combined dye bleaching and silver bleaching is described. In addition to a strong acid, a water-soluble iodide, a water-soluble oxidizing 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 catalysts with redox potentials between +105 mV and -30 mV, the difference between the redox potentials of the catalysts 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 color quality are obtained.
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Jan Gerald
Marthaler Max
Ciba-Geigy AG
Downey Mary F.
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