| hue that cannot be further described by the use of hue names other than its own Note 1 to entry: There are four unique hues: red, green, yellow and blue forming two pairs of opponent hues: red and green, yellow and blue.
Note 2 to entry added: A "unique hue" is sometimes referred to as an "elementary hue". Note 3 to entry: This entry was numbered 845-02-36 in IEC 60050-845:1987.
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