A method of on-press developing a laser sensitive lithographic printing
plate with ink and/or fountain solution is described. The printing member
comprises on a substrate a photosensitive layer soluble or dispersible in
ink and/or fountain solution and capable of hardening upon exposure to a
laser. The plate is exposed with a laser and on-press developed with ink
and/or fountain solution. The exposure and development are performed with
the plate under lightings that contain no or substantially no radiation
below a wavelength selected from 400 to 650 nm, or in the dark or
substantially dark.