2. Printing different colors of words or images on a printing plate is called multicolor overprint. In ancient times, there were two kinds of overprinting. One was that each color was rigid, and then overprinted by color. The other is to brush different colors on a printing plate and print at one time. Multicolor overprinter originated in Song Dynasty and was used for overprinter of paper money. Overprinting of Zhu Mo's books appeared in Yuan Dynasty. There were two-color or even four-color overprinter books in the Ming Dynasty. Printable color printing began in the middle of Ming Dynasty. Its principle is to carve the manuscript into printing plates with different shades, and then overprint one by one, and finally complete the color printed matter similar to the manuscript.
3. The development of multicolor overprint technology and the bud of color printing. Multi-color overprinter originated from multi-color printing in fabric printing and dyeing in the Western Han Dynasty. Multi-color overprinter of books is related to handwritten multi-color books.
4. Overprinting can be roughly divided into two types, one is not embedded together, which is generally more common. In fact, one is overprint and the other can be embedded together. It should be said that its handed down products are very rare. At present, data show that Nian Gengyao, the kiln supervisor in Yongzheng period of Qing Dynasty, had a set of such seals, one of which was 3 * * *, and the largest one had a side length of 4.5.
The invention of overprinter is another great progress of printing. Ordinary block printing books can only print one color at a time, which is called "single printing", while overprinting books have two or more colors. It is made by repeatedly overprinting several pages with the same specifications with different colors in different parts, so it is called "overprinting" or "double printing", and this set of technology is called "overprinting". The book printed in this way is called "overprint" Generally, red and black are used for double-sided printing, so the printed books are called ink books, and those with three colors are called tricolor books. According to the number of colors used, there are four-color books and five-color books.