Photographic diffusion transfer process

Claim 1

A METHOD OF FORMING A PHOTOGRAPHIC IMAGE WHICH COMPRISES EXPOSING TO A SUBJECT AN ELEMENT COMPRISING (1) A SUPPORT, (2) A SILVER PRECIPITATING STRATUM ON THE SUPPORT CONTAINING SILVER PRECIPITATING NUCLEI, AND (3) ASHERED TO SAID STRATUM A LIGHT-SENSITIVE EMULSION LAYER CONTAINING SILVER HALIDE UNIFORMLY DISPERSED IN A MEMBER OF THE CLAS CONSISTING OF AN ALKALI-SOLUBLE ACID-INSOLUBLE DIBASIC ACID ESTER OF A CELLULOSE ETHYL ETHER AND AN ALKALI-SOLUBLE ACID-INSOLUBLE DIBASIC ACID ESTER OF A CELLULOSE ACETATE, DEVELOPING A LATENT IMAGE IN THE EMULSION LAYER WITH AN ALKALINE SILVER HALIDE DEVELOPING SOLUTION CONTAINING A SILVER HALIDE DEVEOPING A GENT AND A SILVER HALIDE SOLVENT FOR A TIME SUFFICIENT TO FORM A SILVER IMAGE AND AN IMAGE-WISE DISTRUBITION OF A SOLUBLE SILVER COMPLEX IN THE EMULSION LAYER, ALLOWING A PORTION OF SAID SILVER COMPLEX TO DIFFUSE IMAGEWISE TO SAID SILVER PRECIPATING STRATUM AND THE SILVER OF SAID PORTION OF SILVER COMPLEX TO BE PRECIPATEDF IN SAID STRATUM BY MEANS OF SAID NUCLEI, AND REMOVING THE EMULSION LAYER FROM SAID STRATUM, THE DIFFUSION OF THE SILVER COMPLEX BEING CARRIED OUT IN THE PRESCENCE OF A MEMBER OF THE CLASS CONSISTING OF A MERCAPTO-1,3,4-OXADIAZOLE, A MERCAPTO-1,3,4,-THIADIAZOLE, A BENZOTHIAZOLINE-2-THIONE ANS 1,3-DIMERTHYLBNZENE-4-SULFONIC ACID.