Photographic bleach compositions and methods of photographic processing
AssigneeEastman Kodak Company
InventorJohn R. Fyson
Life of this patent
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Abstract
Photographic silver halide bleach compositions which are more active than existing bleach compositions and free from environmental and commercial objections thereto comprise as bleaching agent a ferric complex of an alkyliminodiacetic acid the alkyl group of which may be substituted. The bleach solutions may further comprise a silver halide solvent thus rendering them bleach-fix solutions.
Claims15
A method of processing a photographic color material comprising the step of bleaching or bleach-fixing said material with a composition comprising, as the bleaching agent, a ferric complex of an alkyliminodiacetic acid, the alkyl group of which contains from 1 to 6 carbon atoms.
A method of bleaching a photographic color material which comprises contacting said material with an aqueous bleaching solution containing a water-soluble halide and, as the bleaching agent, a ferric complex of an alkyliminodiacetic acid, the alkyl group of which contains from 1 to 6 carbon atoms.
A method of bleach-fixing a photographic color material which comprises contacting said material with an aqueous bleach-fixing solution containing a sufficient concentration of a silver halide solvent to act as a fixing agent and, as the bleaching agent, a ferric complex of an alkyliminodiacetic acid, the alkyl group of which contains from 1 to 6 carbon atoms.
An aqueous photographic bleaching solution containing a water-soluble halide and, as the bleaching agent, a ferric complex of an alkyliminodiacetic acid, the alkyl group of which contains from 1 to 6 carbon atoms.
A photographic bleaching solution comprising an aqueous solution of a ferric complex of methyliminodiacetic acid and potassium bromide.
An aqueous photographic bleach-fixing solution containing a sufficient concentration of a silver halide solvent to act as a fixing agent and, as the bleaching agent, a ferric complex of an alkyliminodiacetic acid, the alkyl group of which contains from 1 to 6 carbon atoms.
A photographic bleach-fixing solution comprising an aqueous solution of a ferric complex of methyliminodiacetic acid and an ammonium or alkali metal thiosulfate.
Dependencies are inferred from the claim text.