A method for making a lithographic printing plate

摘要

The present invention provides a method for making a lithographic printing plate according to the silver salt diffusion transfer process comprising the steps of: image-wise exposing an imaging element comprising on a support in the order given a photosensitive layer comprising a silver halide emulsion and an image receiving layer containing physical development nuclei in water permeable relationship with said emulsion layer, developing said imaging element by means of an alkaline developing solution comprising at least 0.1 mole/l of ascorbic acid as the main developer and at least 0.015 mole/l of an auxiliary developer of the class of the 1-phenyl-3-pyrazolidones in the presence of silver halide solvent(s) characterized in that said developing solution comprises at least 0.003 mole/l of thiosulfate.