Process for preparing silver halide photographic emulsions
AssigneeKonishiroku Photo Industry Co., Ltd.
InventorsHideo Kanisawa, Tamio Kitahata, Hideo Horie
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Abstract
A process for preparing silver halide emulsions having high sensitivity and contrast by adding water-soluble iridium compounds during precipitation or physical ripening and adding water-soluble iodide compounds and sulfer sensitizers during chemical ripening.
Claims8
A process for preparing a silver halide photographic emulsion which process comprises adding a water-soluble iridium compound in an amount of 10.sup.-7 to 10.sup.-4 mole per mole of the silver halide at the stage of precipitation of silver halide grains or physical ripening thereof, and adding a water-soluble iodide in an amount of 10.sup.-4 to 10.sup.-2 mole per mole of the silver halide and a sulfur sensitizer at the stage of chemical ripening thereof.
Dependencies are inferred from the claim text.