PURPOSE: To prevent the degradation in sensitivity after preservation of the emulsion with the laps of time without impairing a corrosion preventive effect by incorporating silver halide emulsions chemically sensitized in the presence of a palladium compd. and further specific compd.
CONSTITUTION: The silver halide particles chemically sensitized in the presence of the palladium compd. at ≥10-4 mol per 1mol silver halide are incorporated into the emulsion. Further, at least one kind of the compds. expressed by formula I are incorporated into the emulsion. In the formula I, R1 denotes a hydrogen atom, alkyl group, alkenyl group, aralkyl group, etc.; R2, R3 respectively denote a hydrogen atom, alkyl group, aryl group, cyano group, alkylsulfonyl group, etc.; R4, R5 respectively denote a hydrogen atom, alkyl group, aryl group, aralkyl group. The palladium compd. refers to a bivalent or quadrivalent palladium salt. Thus, the degradation in the sensitivity of the emulsion after the preservation with the laps of time is prevented without impairing the corrosion preventive effect.