As Newton figured out, white light is a compendium of all the parts of the visible spectrum. This is the additive model of color. Take away the blue hues, and a white light will appear yellowish; and so on and so forth. Yet when you combine paints of every color, you get black. That is subtractive color theory, in which black, not white, represents the presence of all color. Additive color is the realm of transmitted light, while subtractive color is the realm of pigments, dyes and chemicals, explains Honolulu-based color expert Jill Morton. Morton is a former professor at the University of Hawaii who has consulted for Xerox, Kodak and others to whom color matters. "Of course pink is a color," Morton says, "but with that said, pink is indeed not part of the light spectrum. It's an extra-spectral color, and it has to be mixed to generate it."