1. Documents primarily use carbonless paper. Carbon-free carbon paper has been used for all previously existing invoices, contracts, treaties, and other legal effects of formal documents. Since traditional documents are merely plain paper, a copy layer must be added underneath them. Contrarily, special paper is used to bind carbon-free paper.
2. In the case of the triple carbon-free paper receipt, it can be divided into upper paper, middle paper, and lower paper. The top paper is also known as CB Coated Back. Microcapsules containing force-sensitive pigment oil are coated on the back of the paper. The medium paper is also known as the double Coated paper (code CFB, that is, Coated Front and Back). The front of the paper is coated with a chromogenic agent, and the back is coated with microcapsules containing force-sensitive pigment oil. The bottom paper is also known as the Coated paper (code CF, that is, Coated Front), the paper surface is coated with only the color agent. Self-Contained paper (SC, self-contained) is contained in a microcapsule layer coated with chromatin oil on the back and chromatin and microcapsule contained in chromatin oil on the front.
3. The upper paper and the lower paper do not have the carbon copy effect, only the medium paper has the carbon copy effect. In the use of non-carbon paper printed documents, are usually equipped with a small piece of cardboard separated on the joint document, so as to avoid excessive writing force, resulting in other joint documents under the carbon copy.
4. Carbonless paper has roughly four colors; White/red/blue/green and other four colors, to distinguish the role of the joint order.
