If you have ever tried your hand at artistic painting you are aware that color is a complex subject. There are large thick books that drone on and on about color theory, and college level classes that delve, with great detail, into the intricacies of color. You learn that color can be transparent, translucent, opaque, reflective and refractive. It's affected by the intensity and direction of light, and even the angle of the viewer affect the appearance of color.