Direct positive silver halide photographic emulsion

A photographic material for obtaining a direct positive image by the application of surface development in the presence of a fogging agent after image exposure, comprising a support having thereon at least one layer of an internal latent image type silver halide emulsion containing at least one sensitizing dye selected from the group consisting of dyes represented by general formula I, and at least one compound selected from the group consisting of compounds represented by general formula II;

• Formula I:
• ##STR19## wherein Z and Z.sub.1 each represents a non-metallic atomic group necessary for completing a benzoxazole nucleus, a benzothiazole nucleus, a benzoselenazole nucleus, a naphthooxazole nucleus, a naphthothiazole nucleus, a naphthoselenazole nucleus, a thiazole nucleus, a thiazoline nucleus, a pyridine nucleus, or a quinoline nucleus;
• R and R.sub.1 each represents an alkyl group, a substituted alkyl group, or an allyl group;
• X.sup.- represents an acid anion;
• and n represents 1 or 2:
• Formula II:
• ##STR20## wherein Z.sub.2 represents a non-metallic atomic group necessary for completing a thiazole nucleus, a thiazoline nucleus, a selenazole nucleus, a selenazoline nucleus, or a pyrrolidine nucleus;
• Z.sub.3 represents a non-metallic atomic group necessary for completing a rhodanine nucleus, a 2-thiohydantoin nucleus, a 2-thiooxazolidine-2,4-dione nucleus, or a 2-thioselenazolidine-2,4-dione nucleus;
• and R.sub.2 and R.sub.3 each represents a hydrogen atom, an alkyl group, a substituted alkyl group, an aromatic group, or an allyl group, said photographic material containing a fogging agent which acts during development or pre-bath processing to preferentially form surface development nuclei.

A diffusion transfer photographic material comprising a photosensitive unit comprising a layer of an internal latent image type silver halide emulsion associated with a non-diffusible dye image-providing material capable of releasing a diffusible dye in proportion to the amount of developed silver in said silver halide emulsion layer, and a dyeing layer for receiving said diffusible dye, and a processing composition unit for processing the photosensitive unit, said internal latent image type silver halide emulsion containing at least one sensitizing dye selected from the group consisting of dyes represented by general formula I and at least one compound selected from the group consisting of compounds represented by general formula II;

• Formula I:
• ##STR21## wherein Z and Z.sub.1 each represents a non-metallic atomic group necessary for completing a benzoxazole nucleus, a benzothiazole nucleus, a benzoselenazole nucleus, a naphthooxazole nucleus, a naphthothiazole nucleus, a naphthoselenazole nucleus, a thiazole nucleus, a thiazoline nucleus, a pyridine nucleus, or a quinoline nucleus;
• R and R.sub.1 each represents an alkyl group, a substituted alkyl group, or an allyl group;
• X.sup.- represents an acid anion;
• and n represents 1 or 2:
• Formula II:
• ##STR22## wherein Z.sub.2 represents a non-metallic atomic group ncessary for completing a thiazole nucleus, a thiazoline nucleus, a selenazole nucleus, a selenazoline nucleus, or a pyrrolidine nucleus;
• Z.sub.3 represents a non-metallic atomic group necessary for completing a rhodanine nucleus, a 2-thiohydantoin nucleus, a 2-thiooxazolidine-2,4-dione nucleus, or a 2-thioselenazolidine-2,4-dione nucleus;
• and R.sub.2 and R.sub.3 each represents a hydrogen atom, an alkyl group, a substituted alkyl group, an aromatic group, or an allyl group, said photographic material containing a fogging agent which acts during development or pre-bath processing to preferentially form surface development nuclei.