| abstract |
A PHOTOSENSITIVE MATERIAL USEFUL IN COPYING PROCESSES IS PROVIDED BY COMBINING DYES OR COLORLESS DYE BASES WITH PHOTOACTIVATORS SELECTED FROM N-OXIDE COMPOUNDS OF PYRIDINE OR QUINOLINE, OR QUATERNARY SALTS THEREOF, HAVING THE GENERAL FORMULA: UPON EXPOSURE TO LIGHT THE PHOTOACTIVATORS PROVIDE FREE RADICALS WHICH CAUSE A DYE-FORMING OR BLEACHING COLOR CHANGE. (1-(R1-O-),2,3-(-Z-),R-PYRIDINIUM)N X(-) 1-(O=),2,3-(-Z-),R-PYRIDINE OR |