Offset printing plate

摘要

An improved direct offset printing plate high in photographic speed which utilizes silver complex diffusion transfer is obtained by using as a silver halide emulsion a direct positive silver halide emulsion which comprises silver halide grains which contain at least 80 mol % of bromide, the surface of said silver halide grains having thereon an electron acceptor and at least one sensitizing dyes selected from the group consisting of those having the following general formula (I): <IMAGE> (I) and those having the following general formula (II): <IMAGE> (II) (wherein Z, R1-R3, M, A and p and q are as defined in the specification).