When two colors can be combined to make an achromatic color, they are said to be:

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Complementary hues are two colors that when combined in equal parts, cancel each other out and create an achromatic color, such as black, white, or gray. Examples of complementary hues are red and green, blue and orange, and yellow and purple. Primary and secondary hues can be combined to make other colors but do not necessarily create achromatic colors. Nonspectral hues are colors that do not appear in the visible spectrum, such as pink or magenta.

When Two Colors Can Be Combined to Make an Achromatic