Importance

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Abstract

Variation of charged amount accompanying production amount change does not affect photograph performance, a flexible production of an optimal amount corresponding to commercial scene needs may be performed, and a silver halide emulsion having monodispersibility may be produced with sufficient productivity. In the first line a series of continuous operations are performed that a silver salt aqueous solution, a halide salt aqueous solution, and a hydrophilic dispersion medium aqueous solution are mixed and reacted to generate silver halide grain nuclei, and a mother liquor containing the silver halide grain nuclei is stored in cooled state until a amount of production reaches a desired production amount of a silver halide emulsion. A series of continuous operations are performed at least once that when an amount of formation reaches the desired production amount, the cooled mother liquor is ultra-filtrated in the third line to eliminate, to dehydrate, and to concentrate unnecessary salt generated in the formation reaction, and the mother liquor after ultra-filtrated and an addition liquid containing silver halide ultrafine grains prepared in the second line are instantaneously mixed continuously to grow the silver halide grain nuclei.

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First Claim