Novel hectograph transfer sheet and process

Claim 1

A HECTOGRAPH TRANSFER ELEMENT COMPRISING A SUITABLE FOUNDATION CARRYING A FRANGIBLE RESINOUS HECTOGRAPH LAYER WHICH IS TRANSFERABLE TO A MASTER SHEET UNDER THE EFFECTS OF IMAGING PRESSURE TO FORM MASTER IMAGES HAVING THE ABILITY OF PRODUCING HIGHLY INFRARED RADIATION-ABSORBING, THERMOGRAPHICALLY-REPRODUCIBLE DUPLICATE IMAGES ON A COPY SHEET IN THE SPIRIT DUPLICATING PROCESS, SAID LAYER COMPRISING A RESINOUS BINDER MATERIAL WHICH IS AT LEAST PARTLY SOLUBLE IN SPIRIT DUPLICATING FLUIDS, A NON-VOLATILE OILY MATERIAL WHICH IS A NON-SOLVENT FOR SAID RESINOUS BINDER MATERIAL, AND A CONCENTRATED UNDEVELOPED MIXTURE OF DYESTUFF PARTICLES COMPRISING FROM ABOUT 10% TO ABOUT 80% BY WEIGHT OF AN INFRARED RADIATION-ABSORBING DYESTUFF HAVING POOR SPIRIT-SOLUBILITY AND SELECTED FROM THE CLASS OF COMPLEX AZINE DYESTUFFS CONSISTING OF THE NIGROSINES, THE INDULINES AND THE ANILINE COLORS, AND FROM ABOUT 90% TO ABOUT 20% BY WEIGHT OF A NON-INFRARED RADIATIONABSORBING HECTOGRAPH DYESTUFF FROM ANOTHER CLASS AND HAVING GOOD SOLUBILITY IN SPIRIT DUPLICATING FLUIDS, SAID ZAINE DYESTUFF BEING PRESENT IN AN AMOUNT EQUAL TO FROM ABOUT 10% TO ABOUT 60% BY WEIGHT BASED UPON THE TOTAL WEIGHT OF THE HECTOGRAPH TRANSFER LAYER.