1. THE METHOD OF MANUFACTURING PRESCREENED MATERIAL WHICH COMPRISES UNIFORMLY FOGGING A LAYER OF HERSCHELSENSITIVE SILVER HALIDE EMULSION BY EXPOSURE TO SHORT WAVELENGTH LATENT IMAGE-PRODUCING RADIATION, THEN EXPOSING THE LAYER THROUGH A HALFTONE SCREEN UNIFORMLY ILLUMINATED BY LONGER WAVELENGTH IMAGE-FADING RADIATION TO PRODUCE A HALFTONE DOT LATENT IMAGE PATTERN ON SAID EMULSION WITH THE CORNERS OF THE HALFTONE DOTS FADED, SAID HERSCHEL SENSITIVE EMULSION BEING ONE IN WHICH ANY AND ALL LATENT IMAGES PRODUCED BY BLUE LIGHT EXPOSURE CAN BE SUBSTANTIALLY ENTIRELY DESTROYED BY RED AND NEAR INFRARED RADIATION.