1. A PHOTOGRAPHIC HALFTONE MATERIAL COMPRISING A FLAT SUPPORT AND A UNIFORMLY THICK PHOTOSENSITIVE SILVER HALIDE EMULSION LAYER ON THE SUPPORT WITH A HALFTONE PATTERN OF ALBERT REVERSAL DOT AREAS THE HALFTONE PATTERN BEING A UNIFORMLY DISTRIBUTED UNDULATING ONE WITH A SENSITIVITY AT THE MAXIMUM REVERSED POINTS WHICH ARE CALLED THE CORNERS OF THE DOT AREAS, EQUAL TO LESS THAN ONE-FIFTH THE SENSITIVITY AT THE CENTERS OF THE DOTS, PRODUCED BY A PROCESS WHICH INCLUDES EXPOSURE OF THE LAYER THROUGH A HALFTONE SCREEN BETWEEN THRESHOLD ALBERT AND OPTIMUM ALBERT EXPOSURE FOR ALL POINTS OF THE DOT PATTERN AND IMMERSING THE EXPOSED LAYER IN A BLEACH BATH WHICH IS NONSOLVENT FOR SILVER HALIDE.