Image intensification chemistry with blocked incorporated developers
AssigneeEastman Kodak Company
InventorsJohn Texter, David Southby, Jared Mooberry, Roland Willis
Life of this patent
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Abstract
A color photographic element for use with a latent or silver image intensification or amplification method which incorporates a blocked color developing agent. The color photographic element includes at least one silver halide emulsion layer which includes at least about 70 mole percent chloride and has a concentration of silver within the range of about 0.1 mg/m.sup.2 to 2000 mg/m.sup.2. The blocked color developing agent is capable of being unblocked during photographic processing by means of reaction with a dinucleophile reagent. A preferred dinucleophile reagent is hydrogen peroxide, which also acts as an oxidant in the latent or silver image intensification method.
Claims18
A color photographic element comprising a support bearing at least one photographic silver halide emulsion layer and an image dye-forming coupler wherein:
- (a) the photographic silver halide in the emulsion layer comprises at least about 70 mole percent chloride;
- (b) the concentration of silver in the emulsion layer is within the range of about 0.1 mg/m.sup.2 to 2000 mg/M.sup.2 ;
- and
- (c) the element includes a blocked color developing agent capable of being unblocked during photographic processing by means of reaction with a dinucleophile reagent.
A process of forming and amplifying a photographic color image in an exposed color photographic element comprising developing the element in the presence of a dinucleophile reagent, wherein the element comprises a support bearing at least one photographic silver halide emulsion layer and an image dye-forming coupler wherein:
- (a) the photographic silver halide in the emulsion layer comprises at least about 70 mole percent chloride;
- (b) the concentration of silver in the emulsion layer is within the range of about 0.1 mg/m.sup.2 to 2000 mg/m.sup.2 ;
- and
- (c) the element includes a blocked color developing agent capable of being unblocked by means of reaction with the dinucleophile reagent.
Dependencies are inferred from the claim text.