Conversion of photographic photochromic image to permanent fixed chromogenic image

Claim 1

THE PROCESS OF MAKING A PERMANENT IMAGE ON A THIN FILM LAYER OF POLYMERIC MATERIAL TRAVERSABLE BY ULTRAVIOLET LIGHT AND HAVING DISPERSED IN IT, IN REACTIVE PROXIMITY, MOLECULES BOTH OF PHOTOCHROMIC MATERIAL TAKEN FROM THE GROUP CONSISTING OF BENZO-INDOLINOSPIROPYRANS AND 3AROYL-2-METHYLCHROMONES AND OF BASIC SUBSTANTIALLY COLORLESS CHROMOGENIC MATERIAL WHICH YIELDS A COLORED PRODUCT ON UNDERGOING AN ACID-BASE REACTION, INCLUDING THE STEPS OF (A) CREATING A PHOTOCHROMIC IMAGE IN ATHE LAYER BY APPLYNG ULTRAVIOLET LIGHT OT SELECTED AREAS OF THE FILM TO REPRESENT DATA; (B) WHILE THE ULTRAVIOLET-LIGHT-INDUCED IMAGE IS EXTANT, TREATING THE FILM LAYER TO A GAS SELECTED FROM THE GROUP CONSISTIN OF SO2, I2, AND BORON TRICHLORIDE TO CONVERT THE PHOTOCHROMIC MATERIAL IN THE IMAGE AREA TO A CHEMICAL COMPLEX PRODUCT; AND (C) SUPPLYNG ENVIRONMENTAL HEAT TO THE LAYER TO CAUSE AN ACID-BASE REACTION BETWEEN THE COMPLEX PRODUCT MATERIAL AND THE CHROMOGENIC MATERIAL MOLECULES IN THE IMAGE ARE TO PRODUCE THE IMAGE IN TERMS OF A COLORED PRODUCT GENERATED FROMT EH CHROMOGENIC MATERIAL.