When printing, first print a color on the printing plate; Then cover this paper on another printing plate, so that the frame matches each other completely and accurately, and then print another color, and a two-color registration printing is completed. If you are not careful when printing, the two plates don't match, or the characters on the two plates are not accurately positioned when carving, then the two-color characters will be uneven and unreadable after printing. If you want to set multiple colors, you can do this, but the more colors you set, the more troublesome it is to print, which requires extremely skilled technology. This kind of overprinted book in various colors is really bright and beautiful if printed on white paper! This overprinter method was invented in the Yuan Dynasty in the14th century at the latest. The Yuan Dynasty Zhongxing Road (now Jiangling, Hubei) block-printed Notes on Diamond Sutra was overprinted in Zhu Mo, which is the earliest existing overprint. However, it was not until the Ming Dynasty at the end of16th century that this method became widely popular. During the Wanli period of the Ming Dynasty, Min Qiji, Shan Zhaoming, Ling Ruxiang, Ling Mengchu and Ling Ying Elementary School were all famous artists who were good at this kind of printing. In the Qing dynasty, this technology also got corresponding development.

This color matching technology is combined with printmaking technology to produce gorgeous color matching printed matter. Ten bamboo paintings and notes in the late Ming Dynasty are good examples. A print presents all kinds of colors, light and shade, yin and yang to the back, all nuanced. Some ancient prints are really artistic treasures.