Process of diffusion printing and a structure for use therein

Claim 2

A LIGHT-SENSITIVE STRUCTURE COMPRISING A BASE HAVING A SURFACE LAYER WHICH IS HYDROPHILIC TOWARD MILDLY ALKALINE AQUEOUS SOLUTIONS AND WHICH HAS INCORPORATED THEREIN A MEMBER OF A PAIR OF COLOR FORMING COMPONENTS WHICH YIELD UPON INTER REACTION A COLORED REACTION PRODUCT, AND A LIGHT-SENSTITVE COATING WHICH IS RELATIVELY IMPERMEABLE TOWARD MILDLY ALKALINE AQUEOUS SOLUTIONS OVERLYING SAID HYDROPHILIC LAYER AND CONTAINING A LIGHTSENSITIVE WATER-INSOLUBLE DIAZO OXIDE WHICH IS SOLUBLE IN A SOLVENT SELECTED FROM THE GROUP CONSISING OF LIQUID ALIPHATIC ESTERS, ALIPHATIC KETONES AND ALIPHATIC ALCOHOLS AND THE LIGHT DECOMPOSITION PRODUCTS OF WHICH ARE PERMEABLE TOWARD SAID MIDLY ALKALINE AQUEOUS SOLUTIONS.

Claim 3

A PROCESS OF FORMING AN INTERMEDIATE MASTER BY DIFFUSION PRINTING WHICH COMPRISES EXPOSING TO A SOURCE OF ACTINIC LIGHT AN ORGINAL HAVING AN IMAGE THEREON TO BE COPIED TOGETHER WITH A LIGHT-SENSITIVE SHEET COMPRISING A BASE HAVING A SURFACE LAYER WHICH IS HYDROPHILIC TOWARD MILDLY ALKALINE AQUEOUS SOLUTIONS AND WHICH HAS INCORPORATED THEREIN A MEMBER OF A PAIR OF COLOR FORMING COMPONENTS WHICH YIELD UPON INTER REACTION A COLORED REACTION PRODUCT, AND A LIGHT-SENSITIVE COATING WHICH IS RELATIVELY IMPERMEABLE TOWARD MILDLY ALKALINE AQUEOUS SOLUTIONS OVER-LYING SAID HYDROPHILIC LAYER AND CONTAINING A LIGHTSENSTITIVE WATER-INSOLUBLE DIAZO OXIDE WHICH IS SOLUBLE IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF LIQUID ALIPHATIC ESTERS, ALIPHATIC KETONES AND ALIPHATIC ALCOHOLS AND THE LIGHT DECOMPOSITION PRODUCTS OF WHICH ARE PERMEABLE TOWARD SAID MILDLY ALKALINE AQUEOUS SOLUTIONS, REMOVING THE ORIGINAL AND DEVELOPING THE EXPOSED LIGHTSENSITIVE SHEET WITH AN ALKALINE SOLUTION HAVING INCORPORATED THEREIN THE OTHER OF SAID PAIR OF COLOR FORMING COMPONENTS, WHEREBY THROUGH INTER-ACTION OF SAID COMPONENTS A COLOR IS PRODUCED ONLY IN THE LIGHT-EXPOSED AREAS OF THE SHEET AND RINSING THE SHEET WITH WATER TO REMOVE THE ALKALINE SOLUTION.

Claim 4

A PROCESS OF FORMING AN INTERMEDIATE MASTER BY DIFFUSION PRINTING WHICH COMPRISES EXPOSING TO A SOURCE OF ACTINIC LIGHT AN ORGINAL HAVING AN IMAGE THEREON TO BE COPIED TOGETHER WITH A LIGHT-SENSITIVE SHEET COMPRISING A BASE HAVING A SURFACE LAYER WHICH IS HYDROPHILIC TOWARD MILDLY ALKALINE AQUEOUS SOLUTIONS AND WHICH HAS INCORPORATED THEREIN A MEMBER OF A PAIR OF COLOR FORMING COMPONENTS WHICH YIELD UPON INTER REACTION A COLORED REACTION PRODUCT, AND A LIGHT-SENSITIVE COATING WHICH IS RELATIVELY IMPERMEABLE TOWARD MILDLY ALKALINE AQUEOUS SOLUTIONS OVER-LYING SAID HYDROPHILIC LAYER AND CONTAINING A LIGHTSENSTITIVE WATER-INSOLUBLE DIAZO OXIDE WHICH IS SOLUBLE IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF LIQUID ALIPHATIC ESTERS, ALIPHATIC KETONES AND ALIPHATIC ALCOHOLS AND THE LIGHT DECOMPOSITION PRODUCTS OF WHICH ARE PERMEABLE TOWARD SAID MILDLY ALKALINE AQUEOUS SOLUTIONS, REMOVING THE ORIGINAL AND DEVELOPING THE EXPOSED LIGHTSENSITIVE SHEET WITH AN ALKALINE SOLUTION HAVING INCORPORATED THEREIN THE OTHER OF SAID PAIR OF COLOR FORMING COMPONENTS, WHEREBY THROUGH INTER-ACTION OF SAID COMPONENTS A COLOR IS PRODUCED ONLY IN THE LIGHT-EXPOSED AREAS OF THE SHEET AND RINSING THE SHEET WITH WATER TO REMOVE THE ALKALINE SOLUTION.