Định Nghĩa và Ý Nghĩa của "hectograph"

What is "hectograph"?

A hectograph is a printing method where an image is first drawn or transferred onto a special gel-like surface. This surface is then used to create multiple copies of the image. The process involves applying ink to the gel and pressing paper onto it to make the print. Hectographs are known for being relatively simple and inexpensive, and they were often used for reproducing documents and artwork before digital printing became common.