Photographic colour couplers and photographic materials containing them.

摘要

A photographic element comprising a support, at least one photosensitive silver halide layer and in or adjacent said silver halide layer a colour coupler of one of the general formulae: wherein R<1> is a group substantially without any electron-withdrawing capability, R<2> is a substituent not incompatible with the function of the compound, R<3> is an alkyl, aryl or heterocyclic group any of which may be substituted, and X is a coupling-off group.t least