Photographic silver halide emulsion
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United States of America Patent
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Jan 13, 2004
Issued Date -
N/A
app pub date -
Jan 27, 2003
filing date -
Sep 27, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A producing method of a silver halide emulsion comprising the steps of adding silver halide fine grains AgX.sub.0 having an to a silver halide seed crystal emulsion containing at least water, dispersion medium 1 and silver halide crystal, and growing the seed crystal by dissolving the added AgX.sub.0, wherein AgX.sub.0 are formed in dispersion medium solution 2 containing dispersion medium 2, the pH of dispersion medium solution 2 of the time when AgX.sub.0 are formed is from 7.3 to 12.2, the average equivalent-circle projected area diameter of AgX.sub.0 is from 0.001 to 0.2 .mu.m, and AgX.sub.0 are non-twin crystal grains not substantially having twin planes.
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