Direct positive light-sensitive silver halide photographic mater

Details Direct positive light-sensitive silver halide photographic mater Direct positive light-sensitive silver halide photographic mater

1987-11-23

1990-03-20

Michl, Paul R.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430567, 430598, G03C 136

Patent

active

049101307

ABSTRACT:
A direct positive light-sensitive silver halide photographic material having at least one silver halide emulsion layer containing at least two kinds of internal latent image type silver halide grains not previously fogged and having the same spectral sensitivity, and capable of obtaining a direct positive image by effecting surface development while applying and/or after applying overall exposure after imagewise exposure; wherein said at least two kinds of internal latent image type silver halide grains have different sensitivity from each other and at least one of silver halide grains having lower sensitivity is desensitized with use of an organic or inorganic desensitizer, and a method of use of the direct positive light-sensitive silver halide photographic material for carrying out development at a higher temperature.

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patent: 4495274 (1985-01-01), Yoshida
patent: 4613563 (1986-09-01), Murai
patent: 4639410 (1987-01-01), Mochizuki et al.
patent: 4666827 (1987-05-01), Sumi et al.
Research Disclosure 15162.
Research Disclosure 17643 (Dec. 1978).

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