Method including producing a stencil from layer of dichromate-sensitized PVA and fluorescein-type dye

摘要

A method for producing a stencil of PVA (polyvinyl alcohol) including applying and heat-drying to a surface a coating of an aqueous composition of PVA and dichromate sensitizer, and then exposing and developing the dried coating. The aqueous composition includes a fluorescein-type dye or combination of dyes in such proportions as to substantially reduce heat-hardening of the dried coating. The method is particularly useful for preparing etch-resistant stencils used in preparing precision-etched products, such as apertured masks for use in cathode-ray tubes.