Direct positive silver halide photographic material

Details Direct positive silver halide photographic material Direct positive silver halide photographic material

1988-06-23

1990-04-17

Le, Hoa Van

Radiation imagery chemistry: process, composition, or product th

Color imaging process

Using identified radiation sensitive composition in the...

430406, 430567, 430599, 430604, 430605, C03C 108, C03C 526

Patent

active

049179918

ABSTRACT:
A direct positive silver halide photographic material with an internal latent image-type silver halide emulsion layer that provides a direct positive image by a fogging treatment (for example, an overall exposure, or surface developing treatment in the presence of a fogging agent) after imagewise exposure. The silver halide particles which form the emulsion layer consist essentially of a core portion made of silver halide and having been chemically sensitized or doped with metal ions. There are provided a plural number of shell portions made of silver halide containing silver chloride. The chloride content of an inner shell adjacent to the outmost shell of the particles has a smaller amount of chloride content than that of the outermost shell. The photographic material is used by first imagewise exposing it to light, effecting overall fogging treatment on the silver halide particles and processing the exposed photographic material to produce the image.

REFERENCES:
patent: 3935014 (1976-01-01), Klotzer et al.
patent: 4504570 (1985-03-01), Evans et al.
patent: 4623612 (1986-11-01), Nishikawa et al.
patent: 4643965 (1987-02-01), Kubota et al.

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