Direct-positive double exposure process utilizing a primitive, u

Details Direct-positive double exposure process utilizing a primitive, u Direct-positive double exposure process utilizing a primitive, u

1975-03-03

1977-03-08

Louie, Jr., Won H.

Gas separation: apparatus

Electric field separation apparatus

Electrode cleaner, apparatus part flusher, discharger, or...

96 64, 96101, G03C 532, G03C 524

Patent

active

040110818

ABSTRACT:
Processes are disclosed for obtaining positive images in an unfogged, primitive, silver halide emulsion wherein a photographic element comprising a support and said emulsion are imagewise-exposed with a low-intensity light, given an over-all flash exposure with a high-intensity light and developed in a silver halide developer. In one aspect, the silver halide emulsions of this invention are primitive, unfogged, silver halide emulsions which comprise an electron acceptor.

REFERENCES:
patent: 2263002 (1941-11-01), Knott
patent: 3501307 (1970-03-01), Illingsworth
patent: 3736140 (1973-05-01), Collier et al.
patent: 3761276 (1973-09-01), Evans
Farnell et al.: Low Level Chemical Sensitization, J. Phot. Sci., vol. 11, 1963, pp. 57-64.
Maurer et al., A Photographic Low Intensity Desensitization Effect, J. Optical Soc. of America, vol. 42, No. 6, June, 1952, pp. 402-408.

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