The simplest hole printing, also known as mimeograph template, is copy printing. A simple printing method. First, type on special wax paper with a typewriter, or engrave words and pictures with an iron pen. Then, paste the wax paper on ordinary paper, ink it, and print it on the ordinary paper below through the punched or engraved pattern holes. Also called copy printing, it is a kind of stencil printing. In the revolutionary base areas, due to the lack of lead printing conditions, mimeograph has become an important method of text propaganda.