Printing by diazotization

Claim 1

A METHOD OF STENCIL PRINTING UTILIZING THE DIAZODYE PROCESS COMPRISING PROVIDING A DRY POROUS BASE SHEET HAVING A HIGH CONCENTRATION AVAILABLE AT A SURFACE THEREOF OF A MATERIAL SELECTED FROM THE CLASS CONSISTING OF A RELATIVELY NON-VOLATILE, SUBSTANTIALLY NON-OXIDIZING ACID AND A SUBSTANCE WHICH YIELDS NITROUS ACID IN AN ACIDIC MEDIUM, APPLYING TO SAID SURFACE WHILE THE LATTER IS DRY, THROUGH A STENCIL, A COLORING COMPOSITION COMPRISING A DIAZOTIZABLE AMINE, A COUPLER, AND THE OTHER MEMBER OF SAID FIRST NAMED CLASS WHEREBY THE NITROUS ACID YIELDING SUBSTANCE REACTS WITH SAID ACID TO LIBERATE NITROUS ACID, THE NITROUS ACID DIAZOTIZES THE AMINE AND THE DIAZOTIZED AMINE REACTS WITH THE COUPLER TO PRODUCE AN AZODYE, SAID SUBSTANCE WHICH YIELDS NITROUS ACID BEING PRESENT IN AN AMOUNT FROM ABOUT 2 TO 10 TIMES THE STOICHIOMETRIC QUANTITY IN ORDER TO ASSURE COMPLETE DIAZOTIZATION OF THE AMINE, SAID COUPLER BEING PRESENT IN AN AMOUNT BETWEEN ABOUT 2 TO 12 TIMES THE STOICHIOMETRIC QUANTITY IN ORDER TO ASSURE FULL COUPLING OF THE DIAZOTIZED AMINE THEREBY AVOIDING THE PRESENCE ON THE BASE, AFTER THE REACTION, OF DIAZOTIZED AMINE, THE REACTANTS REACTING AT SAID SURFACE SO THAT THE FORMATION OF THE DYE IS SUBSTANTIALLY RESTRICTED TO SAID SURFACE WHEREBY A FINE LINE IMAGE IS OBTAINED.

Claim 2

A METHOD OF STENCIL PRINTING UTILIZING THE DIAZODYE PROCESS COMPRISING PROVIDING A DRY POROUS BASE SHEET HAVING A HIGH CONCENTRATION AVAILABLE AT A SURFACE THEREOF OF A MATERIAL SELECTED FROM THE CLASS CONSISTING OF A RELATIVELY NON-VOLATILE, SUBSTANTIALLY NON-OXIDIZING ACID AND A SUBSTANCE WHICH YIELDS NITROUS ACID IN AN ACIDIC MEDIUM, APPLYING TO SAID SURFACE WHILE THE LATTER IS DRY, THROUGH A STENCIL, A COLORING COMPOSITION COMPRISING A DIAZOTIZABLE AMINE, A COUPLER, AND THE OTHER MEMBER OF SAID FIRST NAMED CLASS WHEREBY THE NITROUS ACID YIELDING SUBSTANCE REACTS WITH SAID ACID TO LIBERATE NITROUS ACID, THE NITROUS ACID DIAZOTIZES THE AMINE AND THE DIAZOTIZED AMINE REACTS WITH THE COUPLER TO PRODUCE AN AZODYE, SAID SUBSTANCE WHICH YIELDS NITROUS ACID BEING PRESENT IN AN AMOUNT FROM ABOUT 2 TO 10 TIMES THE STOICHIOMETRIC QUANTITY IN ORDER TO ASSURE COMPLETE DIAZOTIZATION OF THE AMINE, SAID COUPLER BEING PRESENT IN AN AMOUNT BETWEEN ABOUT 2 TO 12 TIMES THE STOICHIOMETRIC QUANTITY IN ORDER TO ASSURE FULL COUPLING OF THE DIAZOTIZED AMINE THEREBY AVOIDING THE PRESENCE ON THE BASE, AFTER THE REACTION, OF DIAZOTIZED AMINE, THE REACTANTS REACTING AT SAID SURFACE SO THAT THE FORMATION OF THE DYE IS SUBSTANTIALLY RESTRICTED TO SAID SURFACE WHEREBY A FINE LINE IMAGE IS OBTAINED.