There are two kinds of colored paper in general circulation: direct-signed colored paper (because each paper has only one, which is relatively rare and very expensive) and carbon paper colored paper (signature to pattern are printed matter, which is mostly used for various special gifts and also sold at different prices).
Paper is a kind of thin sheet made of plant fiber, which is used for writing pictures, printing books and newspapers, packaging and so on. Paper: the general term for paper. Paper is counted by sheets, so it is called. Paper is generally divided into relief printing paper, newsprint, offset printing paper, coated paper, book cover paper, bible paper, copy paper, paperboard and so on.
Hemp paper in the Western Han Dynasty: In the early years of the Western Han Dynasty, politics was stable, ideology and culture were very active, and there was a strong demand for communication tools. As a new writing material, paper came into being. Xu Shen wrote Shuo Wen Jie Zi, which was written in A.D. 100. On the origin of "paper" He said: "Paper comes from the side, that is, from the side of silk." This sentence shows that the paper at that time was mainly made of spun silk, which is completely different from the paper in the present sense. Xu Shen thinks that paper is a thin piece of silk floss left on the bed after being hit by water. This kind of sheet may be the most primitive "paper", and some people call this "paper" "HeTi". This may be the prelude to the invention of paper. This "paper" record can be traced back to the first year of the Western Han Emperor Yan Yuan (BC 12). It is recorded in Hanshu Zhao Chuan that Cao Wei, the princess of Emperor Cheng, was able to give birth to a prince and was persecuted by Zhao Zhimei. The poison they gave Cao Weineng was wrapped in "Heti" paper, which read: "Tell Wei to try this medicine! You can't re-enter, you know! " It is speculated that paper may be related to silk.