Matching Black & White
While we call black and white colors in their own right, they are actually not.
Technically speaking, white is the complete absence of color combined with a maximum of lightness. Black, on the other hand, is a combination of all colors with a maximum level of darkness.
Both white and black can be combined with any color (even themselves) and work well. These "colors" are considered exceptions to the rules of color matching.
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See also: Color matching