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US 5,670,300 AGranted
Method of processing photographic silver halide materials
AssigneeEastman Kodak Company
InventorsJohn Richard Fyson, Gareth Bryn Evans
Life of this patent
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Abstract
A redox amplification photographic process comprises a sulfite fixing step after development-amplification and prior to peroxide bleaching.
Claims12
A method of processing an imagewise exposed photosensitive photographic silver halide color material comprising a silver halide emulsion having at least 85% silver chloride and having a total silver coating weight of 10 to 500 mg/m.sup.2, comprising treating said material with the following processing baths in order:
- (a) a developer-amplifier solution containing a color developing agent and hydrogen peroxide or a compound that yields hydrogen peroxide,
- (b) a fixer comprising an alkali metal sulfite or a material that yields sulfite as fixing agent,
- (c) a bleach comprising hydrogen peroxide or a compound that yields hydrogen peroxide and an alkali metal halide wherein the pH is in the range 8-11.
Dependencies are inferred from the claim text.