Method of photography including physical contact of two layers capable of reacting with each other in the presence of light

Claim 1

IN A PROCESS OF PRODUCING IMAGES IN A PHOTOSYSTEM IN WHICH AN IMAGE IS FORMED BY INTERACTION OF THE PHOTOLYTICALLY GENERATED HALOGEN CONTAINING FREE RADICALS RESULTING FROM THE DECOMPOSITION OF AN ORGANIC HALOGEN-CONTAINING COMPOUND REPRESENTED BY THE FORMULA R-C-X3 WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF H, CL, BR, I ALKYL AND ARYL AND EACH X IS A HALOGEN SELECTED FROM THE GROUP CONSISTING OF CL, BR AND I ON A MATERIAL SELECTED FROM THE GROUP CONSISTING OF ARYLLAMINES AND POLYMETHINE DYES WHICH EXPERIENCE A CHANGE IN THE PRESENCE OF SAID HALOGEN-CONTAINING FREE RADICALS; THE IMPROVEMENT WHICH COMPRISES: PREPARING A FILM CONTAINING AS THE ESSENTIAL CONSTITUENT, MATERIAL SELECTED FROM THE GROUP CONSISTING OF SAID ARYLAMINES AND POLYMETHINE DYES, AND SUSBTANTIALLY FREE FROM ANY OF SAID FREE-RADICAL PRODUCING ORGANIC HALOGEN COMPOUNDS; BRINGING SAID FREE RADICAL PRODUCING ORGANIC HALOGEN-CONTAINING COMPOUND INTO INTIMATE PHYSICAL CONTACT WITH SAID FILM CONTAINING THE REMAINING CONSTITUENTS OF THE PHOTOSENSITIVE COMPOSITION CONCURRENTLY WITH EXPOSURE OF THE SAME TO FORM AN IMAGE, AND THEEAFTER REMOVING THE IMAGE BEARING COMPOSITION FROM CONTACT WITH THE HALOGEN-CONTAINING ORGANIC COMPOUND REMAINS IN CONTACT WITH THE FILM AND THE IMAGE BEARING EXPOSED FILM IS SUBSTANTIALLY INSENSITIVE TO REEXPOSURE.