The color card paper is the color of nature exists in a certain material embodiment, used for color selection, comparison, communication, is the color to achieve a certain range of uniform standards of tools.
The color card is a preset tool. Designers choose the colors to the printer for physical production, so that the product is manufactured according to the designer's original intention of color selection, which requires the designer of the product color predetermination.
In layman's terms, a color card is a reference that conveys color information. A color card allows you to visualize the product you are buying or the various colors and patterns you are producing.