<P> Additive color is a method to create color by mixing a number of different light colors, with shades of red, green, and blue being the most common primary colors used in additive color system . </P> <P> Additive color is in contrast to subtractive color, in which colors are created by subtracting (absorbing) parts of the spectrum of light present in ordinary white light, by means of colored pigments or dyes, such as those in paints, inks, and the three dye layers in typical color photographs on film . </P> <P> The combination of two of the standard three additive primary colors in equal proportions produces an additive secondary color--cyan, magenta or yellow--which, in the form of dyes or pigments, are the standard primary colors in subtractive color systems . The subtractive system using primaries that are the secondaries of the additive system can be viewed as an alternative approach to reproducing a wide range of colors by controlling the relative amounts of red, green, and blue light that reach the eye . </P>

What do you call any two colors of light that combine to form white light
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