In theory, as long as there are three primary colors of red, blue and yellow, all other colors can be mixed, but the purity of the color is always not high enough, so modern art pigment manufacturers produce high-purity pigments for various hue and brightness colors to meet various needs. From the most basic 12 colors to the usual 24 colors and even 48 colors to more than 60 colors. Special metallic colors are not included.