White
white (adj.) – emitting or reflecting a mixture of all wavelengths of strongly saturated light with high intensity. White is not strictly a colour because it does not correspond to a single hue, but a mixture of all hues. In the RGB colour model, white is achieved by mixing light of all three additive primary colours, Red (R), Green (G), and Blue (B). In the CMYK colour model white cannot be achieved because mixing differently pigmented inks will always result in a darker mixture. Thus a mixture of all three subtractive primary colours, cyan (C), magenta (M), and Yellow (Y), yields a grey. Inks that are strongly saturated will produce darker greys, but because of ink impurities, a pure black cannot be achieved. Therefore black ink (K) is added to the CMYK model. White is a result of using a paper, that equally reflects all wavelengths. Unlike radiant white light emitted from a light source, white paper is never entirely white, even if strongly bleached and containing optical brighteners.
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