Process and photographic material for the direct production of positive photographicimages

Claim 1

A PROCESS FOR PRODUCING PHOTOGRAPHIC IMAGES WHICH COMPRISES FORMING A FIRST SILVER SALT EMULSION LAYER OF RELATIVELY HIGH LIGHT SENSITIVITY AND A SECOND SILVER SALT EMULSION LAYER OF RELATIVELY LOW LIGHT SENITIVITY BUT DEVELOPABLE WITHOUT THE PRESENCE OF A LATENT IMAGE, SAID LAYERS BEING DISTINCT AND SEPARABLE FROM EACH OTHER, AND THE SILVER SALT OF THE FIRST LAYER BEING A HALIDE, SUBJECTING SAID FIRST LAYER TO AN EXPOSURE TO THE IMAGE TO THE REPRODUCED TO FORM A LATENT IMAGE IN THIS LAYER, CONTACTING EACH OF SAID LAYERS WITH A DEVELOPER SOLUTION THAT DEVELOPS ONLY THE LATENT IMAGE OF THE FIRST LAYER AND IS CAPABLE OF REDUCING THE SILVER SALT OF SAID SECOND LAYER WITHOUT PRIOR EXPOSURE, SAID DEVELOPER SOLUTION BEING AN ORDINARY SILVER SALT DEVELOPING SOLUTION CONTAINING AS A SOLVENT AN AGENT WHICH HAS A HIGHER DISSOLVING POWER FOR THE SILVER SALT IN THE SECOND EMULSION THAN THE SILVER SALT IN THE FIRST EMULSION, AND CONTAINING SALTS HAVING THE SAME ANIONS AS THE SILVER SALTS OF THE FIRST LAYER AT MOST IN SUCH QUANTITY THAT THE DEVELOPMENT OF THE SILVER SALT IN THE SECOND LAYER IS NOT PREVENTED UNTIL THE DEVELOPING SOLUTION FORMS AN EXTREMELY FAINT NEGATIVE IMAGE IN THE FIRST LAYER, HOLDING SAID LAYERS IN FACE-TO-FACE CONTACT DURING CONTACT WITH SAID DEVELOPER SOLUTION TO FORM A NEGATIVE SILVER IMAGE IN SAID FIRST LAYER AND CAUSE MIGRATION OF DISSOLVED ANIONS FROM THE SILVER HALIDE THUS DEVELOPED TO THE ADJACENT AREAS OF SAID SECOND LAYER, THE RELATIVE SILVER COMPOUND CONCENTRATION IN THE LAYERS BEING SUCH THAT THIS MIGRATION LIMITS THE SILVER SALT REDUCTION BY THE DEVELOPER SOLUTION IN THE SECOND LAYER TO NON-ADJACENT AREAS, THEREBY FORMING A CONSPICUOUS POSITIVE SILVER IMAGE IN SAID SECOND LAYER, AND THEREAFTER SEPARATING SAID FIRST AND SECOND LAYERS.