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AssigneeFuji Photo Film Co., Ltd.
InventorsMitsuo Saitou, Katsumi Hirano, Ashita Murai, Seiji Akiyama
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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.
A color diffusion transfer photographic film unit comprising:
A direct positive silver halide emulsion containing a core/shell type grain in which 60% or more of the projected area of all grains is shared by monodispersed parallel twin crystal-containing type tabular grains having an aspect ratio of 1.5 or more and two or three twinning planes, wherein the shell of the core/shell 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.
Dependencies are inferred from the claim text.