A silver halide photographic emulsion is described, which has halogen composition comprises at least 60 mole % of silver chloride, 40 mole % or less of silver bromide, and 5 mole % or less of silver bromide. Grain formation is performed in the presence of a silver halide solvent selected from the group consisting of tetrasubstituted thioureas and organic thioethers, and from 10.sup.-8 to 10.sup.-5 mole of a water-soluble iridium compound per mole of silver halide. This photographic emulsion exhibits high sensitivity and provides high contrast even by flash exposure. Thus, it is useful for the production of light-sensitive materials to be used in the production of printing plates in accordance with photographic engraving.
A silver halide photographic material comprising a hydrophilic colloidal layer structure including at least two silver halide emulsion layers provided on at least one common side of a transparent support, wherein the average content of iridium compound per unit mol of silver in the silver halide emulsion layer on the side nearer to the support is greater than that of the silver halide emulsion layer located further from the support, and, characterized by at least one of (1) when exposed to laser light having a wavelength of 600 to 850 nm, the maximum value of .gamma. on the characteristic curve of optical density versus exposure (logarithm) is not more than 3.2; or (2) the average grain size of the grains in the silver halide emulsion layer located further from the support is greater than that of the grains in the silver halide emulsion layer located nearer to the support. Further, a process for the processing of a silver halide photographic material is provided, characterized in that the silver halide photographic material as defined above is used wherein the total coated amount of gelatin and silver on the side of the support having the silver halide layers are 3.5 g/m.sup.2 or less and 2.7 g/m.sup.2 or less, respectively, is conveyed at a line speed of 1,500 mm/min and all steps of development, fixing, rinse and drying are completed within 60 seconds in a roller type automatic processor.
A silver halide photographic light-sensitive material is disclosed, comprising a monodisperse silver halide emulsion of 0.30 .mu.m or less in average silver halide grain size containing at least 75 mol % silver chloride and 2 mol % or less silver iodide, and having incorporated in said emulsion a dye represented by the formula (I) ##STR1## wherein Z represents atoms forming a thiazoline nucleus, a thiazole nucleus, or a benzothiazole nucleus, X represents an oxygen atom or a sulfur atom, and R.sub.1 and R.sub.2 each represents an unsubstituted or substituted aliphatic group or an unsubstituted or substituted aromatic group.
An ultra-high contrast silver halide photographic material which is suitable for daylight use and which has at least one silver halide emission layer on a support, wherein the emulsion layer contains cubic silver halide grains having a mean grain size of 0.15 .mu.m or less and containing silver chloride in an amount of 99 mol % or more. The material can contain a rhodium salt or an organic desensitizer for lowering the sensitivity while maintaining the high contrast photographic property thereof.
A silver halide photographic emulsion is subjected to sulfur or gold-sulfur sensitization in the presence of a combination of (1) at least one of an organic thioether compound or a tetrasubstituted thiourea and (2) a nitrogen-containing heterocyclic compound, to achieve the prevention of pressure desensitization and safelight aptitude deterioration.
