Silver halide photographic materials
AssigneeFuji Photo Film Co., Ltd.
InventorTadashi Ogawa
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Abstract
A water-soluble silver salt and a water-soluble halide are reacted to obtain silver halide particles, and these are, after being demineralized, transhalogenated by adding thereto a water-soluble bromide in an amount of 0.1 mol % to 7 mol % of the total silver halide amount just before or during the sulfur sensitization, to obtain a sulfur-sensitized silver halide emulsion of high sensitivity. The present photographic materials contain the sulfur-sensitized silver halide emulsion and have high sensitivity and excellent pressure characteristics. The transhalogenation along with the sulfur sensitization is effective for the improvement of the sensitivity and the pressure characteristics of the materials.
Claims13
A silver halide photographic material comprising a support having provided thereon a sulfur-sensitized silver halide emulsion, wherein the silver halide particles in the emulsion as formed by the reaction of a water-soluble silver salt and a water-soluble halide are, after demineralization, subjected to transhalogenation along with sulfur sensitization by the addition of a water-soluble bromide to the emulsion in an amount of 0.1 mol % to 7 mol % of the total amount of the silver halide therein just before or during the sulfur sensitization.
Dependencies are inferred from the claim text.