Imaging element and method for making aluminum lithographic printing plates according to the silver salt diffusion transfer process

摘要

The present invention provides an imaging element comprising in the order given (i) a hydrophilic grained and anodized aluminum support, (ii) an image receiving layer containing physical development nuclei and (iii) a photosensitive layer containing a silver halide emulsion being in water permeable relationship with said image receiving layer characterized in that the sum of the surface areas of subsidences amounts to at least 50% of the total surface area area of the grained and anodized side of said support.