Spectrally sensitized prefogged direct-positive silver halide ph

Details Spectrally sensitized prefogged direct-positive silver halide ph Spectrally sensitized prefogged direct-positive silver halide ph

1995-06-13

1996-03-26

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

Transfer procedure between image and image layer, image...

Diffusion transfer process, element, or identified image...

430230, 430411, 430569, 430596, 430599, 430642, G03C 1485, G03C 806, G03F 707

Patent

active

055019390

ABSTRACT:
The present invention provides a photographic material with a pH at 25.degree. C. of at most 7, containing on a support at least one layer, comprising a prefogged direct-positive silver halide emulsion spectrally sensitized with one or more electron-accepting sensitizing dyes in a total amount of at least 0.15 mmole/mole silver halide, the silver halide crystals of said prefogged direct-positive silver halide emulsion containing silver chloride for at least 60 mole %, silver bromide in a range from 0.5 mole % to 39.98 mole % and silver iodide in a range from 0.02 mole % to 2 mole %, characterized in that said silver halide cristals contain silver iodide for at least 0.20 mmole/mole AgX in the outer 10% by weight of said cristals and said layer contains a gelatin species containing Ca.sup.2+ in an amount ranging from 0.2% to 1% by weight.

REFERENCES:
patent: 4134769 (1979-11-01), Yoshida et al.
patent: 4175965 (1979-11-01), Yoshida et al.
patent: 4743525 (1988-05-01), Yamamoto et al.
patent: 5427889 (1995-06-01), Saikawa et al.

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