Process for the production of direct-positive photographic image

Details Process for the production of direct-positive photographic image Process for the production of direct-positive photographic image

1977-11-03

1979-02-13

Louie, Jr., Won H.

Gas separation: apparatus

Electric field separation apparatus

Including gas flow distribution means

96 95, 96 99, 96107, G03C 524, G03C 128

Patent

active

041393872

ABSTRACT:
Positive images including color images are obtained by imagewise exposure and development of a material which comprises at least one light-sensitive silver halide emulsion layer which contains an unfogged direct-positive silver halide emulsion, when the development is carried out in the presence of a fogging agent of the formula ##STR1## wherein the symbols are defined as hereinafter. The fogging agent is preferably contained in a layer of the material and more preferably in the unfogged direct-positive silver halide emulsion layer. For the production of color instant images the material may also contain non-diffusible color providing compounds capable in their oxidized form of being split under alkaline photographic development conditions to release diffusible dyes.

REFERENCES:
patent: 3227552 (1966-01-01), Whitmore
patent: 3486901 (1969-12-01), Karlson
patent: 3761266 (1973-09-01), Milton
patent: 3977880 (1976-08-01), Saito
patent: 4030925 (1977-06-01), Leone et al.

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