Duplicating method and element for use therein

Claim 1

THE METHOD OF PRODUCING MULTIPLE COPIES BY A DUPLICATING PROCESS USING A MASTER IMAGED WITH A MATERIAL CONTAINING A LARGE PROPORTION OF A WATER AND ALCOHOL SOLUBLE SALT OF A POLYVALENT METAL CAPABLE OF REACTION WITH A SULFIDE ION TO FORM A HIGHLY COLORED POLYVALENT METAL SULFIDE AND A WATER AND ALCOHOL SOLUBLE ORGANIC THIO COMPOUND CAPABLE OF RELEASING SULFIDE IONS FROM SOLUTION IN A MEDIUM SELECTED FROM THE GROUP CONSISTING OF ALCOHOL AND WATER AND WHEREIN THE MATERIALS ARE DISPERSED AS SEPARATE COMPONENTS IN A WAX MATRIX IN WHICH BOTH OF THE COMPOUNDS ARE INSOLUBLE, COMPRISING CONTACTING THE IMAGED SURFACE OF THE MASTER WITH COPY SHEETS WETTED WITH A FLUID WHICH IS A SOLVENT FOR THE SULPHUR CONTAINING COMPOUND AND THE METAL SALT WHEREBY SOME OF EACH OF THE COMPOUNDS IS LEACHED FOR TRANSFER FROM THE IMAGED MASTER TO THE COPY SHEETS WHILE IN SOLUTION WHEREBY REACTION CAN TAKE PLACE TO FORM THE COLORED REACTION PRODUCT IN THE COPY SHEETS.