A coupler having as a coupling-off group an alkyl group substituted with an electron source capable of stabilizing a carbonium ion enables formation of a dye image in a photographic silver halide material.
一种耦合剂具有一个被电子源取代的烷基作为耦合基团,该电子源能够稳定羰离子,从而在照相卤化
银材料中形成
染料图像。