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Related to dominant wavelength: Complementary wavelength, excitation purity
wavelength, dominant (of a colour stimulus, not purple)
Wavelength of the monochromatic light stimulus that, when combined in suitable proportions with the specified achromatic light stimulus, yields a match with the colour stimulus considered. Note: When the dominant wavelength cannot be given (this applies to purples), its place is taken by the complementary wavelength (CIE). See complementary colour.