Patent ID: 7700266

Claim:
A process for developing a radiation-imaged, negative working lithographic plate having a hydrophilic substrate and an overlying solvent-soluble, non-diazo based, oleophilic, photopolymerizable resin coating in which photopolymerized image regions have cohesion and adhesion to said hydrophilic substrate and non-image regions have lower cohesion and adhesion to said hydrophilic substrate than the cohesion and adhesion in the image regions, respectively, comprising: exposing the entire coating to a spray of water at a pressure greater than 1000 psi, whereby the water mechanically and completely removes only the non-image regions of the coating from the substrate without dissolution of any of said resin, thereby directly producing a printing plate without further irradiation, having an image pattern of oleophilic regions of said coating and hydrophilic regions of said substrate.