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). Colored cardboard is the embodiment of colors existing in nature on a certain material. It is used for color selection, comparison and communication, and it is a tool to achieve uniform color standards in a certain range. Color card is a preset tool. Designers choose colors and give them to the printing factory for physical production, so as to make products according to the original intention of designers in color selection, which requires designers to set the colors of products in advance.