There is a series of interesting posts about color on Mark Kennedy’s blog- Temple of Seven Golden Camels =”an online repository for everything I know about story boarding, film making,drawing and animation.” The two most recent posts help to explain through a series of illustrations the concept that “color is value.”
“Using tones carelessly can get you into trouble. Using spots of tone that are unrelated to each other can result in confusion, much like the concept behind camouflage.”