Method of preparing a blend of fogged, direct-positive silver ha

Details Method of preparing a blend of fogged, direct-positive silver ha Method of preparing a blend of fogged, direct-positive silver ha

1974-06-07

1977-05-17

Louie, Jr., Won H.

Gas separation: apparatus

Chromatography type apparatus

96120, 96107, 96108, G03C 136, G03C 128

Patent

active

040239721

ABSTRACT:
A method is described of preparing a blend of direct-positive silver halide emulsions that has a pAg value of at least 8.35 from two or more direct-positive silver halide emulsions of different average grain-sizes comprising fogged silver halide grains and having pAg values below 8.35, without inducing physical ripening, by raising the pAg to the value of at least 8.35 before or after blending the emulsions, and providing at least one electron-accepting or halogen-conducting compound, at the surface of the fogged silver halide grains prior to raising the pAg to the value of at least 8.35.

REFERENCES:
patent: 3367778 (1968-02-01), Berriman
patent: 3531290 (1970-09-01), Litzerman
patent: 3615573 (1971-10-01), Smith et al.
patent: 3615610 (1971-10-01), Florens et al.

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