| abstract |
a) imagewise exposing a lithographic printing plate precursor, the printing plate precursor comprising a hydrophilic support and a coating comprising a colorant precursor provided thereon, thereby Forming a lithographic image comprising printed and non-printed areas; and b) developing the plate precursor thereby removing the coating of the non-printed areas from the support; and c) drying the plate precursor. And d) exposing the lithographic plate to heat or radiation, thereby inducing a color change of the coating in the printed area, wherein-prior to step b), the coating and support in the non-printed area are 5 characterized by CIE 1976 color difference Delta] E 1 is less than 2.0 or; - after step d), between the regions not printed with the coating of the print area IE 1976 color difference Delta] E 2 is 6.8 or more, comprising a method of creating a lithographic printing plate. |