| 摘要 |
A high contrast photographic image is formed by development of a photographic material with an amine-free developer having a low pH value. The photographic material has at least one silver halide emulsion on a support. The silver halide emulsion in the emulsion layer contains an iridium salt and/or a rhodium salt and comprises a gold-sensitized and sulfur-sensitized silver chlorobromide emulsion or silver chloroiodobromide emulsion having a silver chloride content of 50 mol% or more and a silver iodide content of 5 mol% or less. The emulsion layer contains a hydrazine compound represented by formula (I): (* CHEMICAL STRUCTURE *) (I) wherein R1 represents an aliphatic group or an aromatic group, which contains a partial structure, -O(-CH2CH2O)n-, -O(-CH2CH(CH3)O)n- or -O(-CH2CH(OH)CH2O)n-, wherein n is an integer of 3 or more, as a part of the R1 substituent, or contains a quaternary ammonium cation as a part of the R1 substituent; G1 represents -CO-, -COCO-, -CS-, -C(=NG2R2)-, -SO-, -SO2- or -P(O)(G2R2)-, wherein G2 represents at least one chemical bond selected from the group consisting of -O-, -S- or -N(R2)-, and R2 represents an aliphatic group, an aromatic group or a hydrogen atom. When the molecule has a plurality of R2 groups, they may be same as or different from each other. One of A1 and A2 is a hydrogen atom, and the other is a hydrogen atom, an acyl group, an alkylsulfonyl group or an arylsulfonyl group.
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