Dye-forming method, color developing compositions, photosensitive materials and color developing agent precursors

摘要

A dye-forming method comprising: reacting a dye-forming coupler and a color developing agent precursor represented by the following general formula (I):wherein A3 represents a group other than a hydrogen atom which leaves, accompanied by the bonding electron pair with the nitrogen atom in general formula (I), to thereby form a color developing agent; A2 represents a group which leaves in association with a dye-formation; and A1 represents a group which forms a dye together with the nitrogen atom and the coupler.