Direct positive silver halide emulsion and a color diffusion tra

Details Direct positive silver halide emulsion and a color diffusion tra Direct positive silver halide emulsion and a color diffusion tra

1992-11-27

1994-08-02

Stoll, Robert L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430569, G03C 1005

Patent

active

H00013439

ABSTRACT:
There is disclosed a novel direct positive silver halide emulsion and a color diffusion transfer photographic film unit in which the above emulsion is used and which provides a high sensitivity and a low minimum density. The direct positive silver halide emulsion contains a core/shell type grain in which 60% or more of the projected area of all grains is shared by a monodispersed parallel twin crystal-containing type tabular grain having an aspect ratio of 1.5 or more, wherein the shell of the core/sell grain is formed by adding a silver salt in which at least 30 mole % of the silver salt is a non-twin crystal silver halide fine grain emulsion having an average grain size of 0.12 .mu.m or less.

REFERENCES:
patent: 4879208 (1989-11-01), Urabe
patent: 4945037 (1990-07-01), Saitou
patent: 5155017 (1992-10-01), Sato et al.

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