Production of photographic dye images

Claim 1

A PROCESS OF PRODUCING A PHOTOGRAPHIC DYE IMAGE IN A PHOTOGRAPHIC EMULSION DIFFUSELY COLORED WITH AN AZO DYE AND ALSO CONATINING A SILVER IMAGE WHICH COMPRISES TREATING SAID SILVER IMAGE WITH AN ACID SOLUTION CONTAINING ESSENTIALLY AS THE SOLE ACID-PRODUCING MATERIAL A SUBSTANTIAL AMOUNT OF A COMPOUND WHICH FURNISHES IN SOLUTION AN ION HAVING THE FORMULA RSO3- WHERE R IS A MEMBER OF THE GROUP CONSISTING OF ORGANIC RADICALS AND RADICALS OF THE FORMULA R1R2N- WHERE R1 AND R2 ARE EACH MEMBERS OF THE GROUP CONSISTING OF HYDROGEN AND ORGANIC RADICALS, SAID SOLUTION BEING NON-DESTRUCTIVE WITH RESPECT TO THE DYE BUT REACTING WITH SAID SILVER IMAGE TO OXIDIZE IT AND SUBSTANTIALLY SIMULTANEOUSLY TO FORM A REDUCING SUBSTANCE WHICH DESTROYS SAID DYE AT THE POINT OF SAID SILVER IMAGE, SAID COMPOUND BEING INCAPABLE OF REDUCTION TO PRODUCTS WHICH ARE REOXIDIZABLE TO THE ORIGINAL COMPOUND DURING TREATMENT OF THE SILVER IMAGE.