| abstract |
Photosensitive planographic printing plates which have improved safety against a white lamp, improved suitability for plate inspection to the developed printing plates, and greater ease with which register marks can be visually observed, without any deteriorated sensitivity, and which comprise a) an o-naphthoquinonediazide compound, b) an aqueous alkali-soluble, water-insoluble polymer, c) a blue-colorant, and d) a colorant of which the proportion of absorbance at wavelengths of 436 nm, 417 nm and 500 nm is 100 : 65 or less : 40 or less. |