Dry silver photo-sensitive compositions comprising an intimate mixture of a substantially light-insensitive silver compound which upon reduction gives a visible change and sufficient of a silver halide to catalyse said reduction to give a visible change in those areas where the silver halide has been exposed to light and when the mixture is heated in the presence of a reducing agent, and as an acutance dye a compound of the general formula:
干
银光敏组合物,包括一种基本不感光的
银化合物的亲密混合物,该化合物在还原时会产生可见的变化,以及一种足以催化上述还原的卤化
银的亲密混合物,在卤化
银暴露于光的区域以及在存在还原剂的情况下加热该混合物时,卤化
银会产生可见的变化: