Photographic process involving amplification with CO (III) compl

Details Photographic process involving amplification with CO (III) compl Photographic process involving amplification with CO (III) compl

1976-03-01

1977-05-10

Klein, David

Gas separation: apparatus

Electric field separation apparatus

With control means responsive to sensed condition

96 22, 96 53, 96 55, 96 60BF, 96 61R, G03C 716, G03C 700, G03C 538, G03C 532

Patent

active

040226166

ABSTRACT:
A process is disclosed for producing a positive colored image in an imagewise exposed photographic element. The element is comprised of a support having coated thereon at least one layer of a hydrophilic colloid coating containing at least one light-sensitive silver halide and, in association with said silver halide, a substantially colorless, image dye-providing compound. The image dye-providing compound is reactive with oxidized color-forming reducing agent to yield a bleachable image dye. The process is comprised of the following steps: A silver image is developed in the imagewise exposed areas of the photographic element and a low level silver fog is formed in the remaining areas of the element. Image dye-providing compound is then converted to a bleachable image dye uniformly throughout the photographic element using the silver as a catalyst for a redox reaction of a color-forming reducing agent and a cobalt(III) complex amplifier oxidizing agent. A silver-dye-bleach step is then performed which bleaches the uniformly generated dye in proportion to the amount of silver present. This produces a positive dye image. Finally, the photographic element is fixed.

REFERENCES:
patent: 3293032 (1966-12-01), Jaekan et al.
patent: 3503741 (1970-03-01), Wilson et al.
patent: 3765891 (1973-10-01), Travis
patent: 3841873 (1974-10-01), Mowrey et al.

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