Direct-positive photographic material

Details Direct-positive photographic material Direct-positive photographic material

G - Physics

03

C

96/112

G03C 1/485 (2006.01)

Patent

CA 1037762

ABSTRACT OF THE DISCLOSURE A photographic material for producing direct-positive photographic images with at least one silver halide emulsion layer containing unfogged heterodisperse silver halide grains with a core which consists predominantly of silver bromide and a localised phase with a high silver chloride content of at least 20 mols-%, the total concentration of silver chloride, based on the total silver halide content of the grain, is less than 30 mols-%, and at least 10 % by weight of the silver halide grains have a diameter which deviates by at least 40 % from the average grain diameter in which the silver halide grains are not or only slightly chemically sensitized on the surface. This provides a greater sensitivity to light and improves the whiteness of image background in comparison with the previous art.

203455

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