Process for the preparation of a solid adduct of sulfuric acid a

Details Process for the preparation of a solid adduct of sulfuric acid a Process for the preparation of a solid adduct of sulfuric acid a

1988-09-12

1989-11-07

Warren, Charles F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

564 32, 564 73, C07C12701

Patent

active

048794139

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).

REFERENCES:
patent: 4116664 (1978-09-01), Jones
patent: 4310343 (1982-01-01), Verdegaal et al.
Nurekhmetov et al., CA 78:97098j (1973).
Molodkin et al., CA 69:43305d (1967).

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