| 摘要 |
PURPOSE:To obtain the entitled emulsion having a narrow distribution of both of silver halide compsns. and silver halide grain sizes, by producing silver halide while regulating silver ion concn. using the third soln, contg. bromide ions and chloride ions. CONSTITUTION:The first silver ion soln. is mixed with the second halide ion soln. in the presence of a protective colloid by the double jet method, to prepare a silver halide emulsion composed of (a) mol% silver bromide, (b) mol% silver chloride, and (c) mol% silver iodide, where a>0, b>0, c>=0, a+b+c=100. The silver halide emulsion is prepared by adjusting the molar ratio of bromide/chloride/iodide ions of the second soln. to a:kb:c, where 1>=k>=0.9, and further using the third soln. contg. bromide and chloride ions besides the first and the second soln. in the additional step.
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