| 摘要 |
The invention relates to a silver halide photographic emulsion comprising silver halide grains and the reductone of Formula I <CHEM> wherein R1 and R2 are the same or different, and may represent H, alkyl, cycloalkyl, aryl, or an alkyl group with a solubilizing group such as -OH, sulfonamide, sulfamoyl, or carbamoyl, R1 and R2 may be joined to complete a heterocyclic ring such as aziridinyl, azetidinyl, pyrrolidinyl, piperidinyl, morpholinyl, piperazinyl, or pyridinyl, R4 and R5 are H, OH, alkyl, aryl, cycloalkyl, or may together represent an alkylidene group, n is 1 or 2 and R3 is H, alkyl, aryl, or CO2R6 where R6 is alkyl, and wherein the logarithm of the partition coefficient for the reductone when equilibrated as a solute between n-octanol and water (logP) is less than 0.293.
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