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AssigneeFuji Photo Film Co., Ltd.
InventorsShigeo Hirano, Tadao Sugimoto, Nobuyuki Tsujino
Estimating the term…
A direct positive silver halide photographic light-sensitive material is described comprising a support having coated thereon at least one light-sensitive silver halide photographic emulsion layer, wherein at least one layer of the light-sensitive silver halide photographic emulsion layers and other hydrophilic colloid layers contains a compound represented by formula (I) ##STR1## wherein R.sup.1 and R.sup.2 can each represent a hydrogen atom, an aliphatic group, an aromatic group, or a heterocyclic group; R.sup.3 represents a hydrogen atom or an aliphatic group; R.sup.4 represents a hydrogen atom, an aliphatic group, or an aromatic group; and X represents a divalent aromatic group. The direct positive silver halide photographic light-sensitive material containing the above novel fogging agent compound has good preservability and provides excellent reversal photographic images in spite of changes (1) in the bromine ion concentration in a developing solution used for processing, (2) in the particle size of the internal latent image type silver halide grains, and (3) in the amount of the fogging agent employed.
A direct positive silver halide photographic light-sensitive material comprising a support having coated thereon at least one light-sensitive internal latent image silver halide photographic emulsion layer, said silver halide photographic emulsion not being previously fogged, wherein at least one layer of the light-sensitive silver halide photographic emulsion layers and other hydrophilic colloid layers contains a fogging amount of a compound represented by formula (I) ##STR8## wherein R.sup.1 and R.sup.2 can each represent a hydrogen atom, an aliphatic group, an aromatic group, or a heterocyclic group;
A method of forming a direct positive image which comprises imagewise exposing a direct positive silver halide photographic light-sensitive material comprising a support having coated thereon at least one light-sensitive internal latent image type silver halide photographic emulsion layer, said silver halide photographic emulsion not being previously fogged wherein at least one layer of the light-sensitive internal latent image type silver halide photographic emulsion layers and other hydrophilic colloid layers contains a fogging amount of a compound represented by formula (I) ##STR10## wherein R.sup.1 and R.sup.2 can each represent a hydrogen atom, an aliphatic group, an aromatic group, or a heterocyclic group;
Dependencies are inferred from the claim text.