Patent ID: 8623586

Claim:
A method of lithographically printing images on a receiving medium, comprising in order: (a) providing a lithographic plate comprising on a substrate a photosensitive layer capable of solubilization upon exposure to a laser having a wavelength selected from 200 to 1200 nm, the solubilized areas of said photosensitive layer being soluble or dispersible in ink and/or fountain solution; (b) imagewise exposing said plate with said laser to cause solubilization of said photosensitive layer in the exposed areas; (c) applying a light-blocking material onto said plate on at least the photosensitive layer coated side, wherein said light-blocking material as applied to said plate prevents at least 90% of light in the wavelength range of from 300 to 450 nm from reaching said photosensitive layer; wherein said light-blocking material is a dye, a pigment or a combination of at least one dye and/or at least one pigment, capable of blocking light in the wavelength range of from 300 to 450 nm and is transparent to most of the wavelength range of visible light (d) developing said plate with ink and/or fountain solution on a lithographic press to remove the solubilized areas of said photosensitive layer; and (e) lithographically printing images from said plate to the receiving medium.