Method of processing silver dye bleaching materials and preparat

Details Method of processing silver dye bleaching materials and preparat Method of processing silver dye bleaching materials and preparat

1977-08-12

1978-11-14

Brown, J. Travis

Gas separation: apparatus

Electric field separation apparatus

With means for vapor or liquid contact

96 60R, G03C 700, G03C 532

Patent

active

041254023

ABSTRACT:
A method of processing silver dye bleaching materials is provided wherein a combined aqueous dye and silver bleaching bath is used which contains a strong acid, a water-soluble iodide, a dye bleaching catalyst, a water-soluble oxidant and an antioxidizing agent, wherein the antioxidizing agent is an alkali metal, alkaline earth metal or ammonium bisulphite adduct of an organic carbonyl compound. The dye and silver bleaching can also be carried out in separate baths and then the aqueous dye bleaching bath contains a strong acid, a water-soluble iodide, a dye bleaching catalyst and the antioxidizing agent, which is again said bisulphite adduct. The strongly acid baths which contain as antioxidizing agents the bisulphite adducts are stable over a lengthy period of time, exert a lasting antioxidizing action and are free of offensive odors.

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