| measure of the proportions of the amounts of the monochromatic stimulus and of the specified achromatic stimulus that, when additively mixed, match the colour stimulus considered Note 1 to entry: In the case of purple stimuli, the monochromatic stimulus is replaced by a stimulus whose chromaticity is represented by a point on the purple boundary. Note 2 to entry: The proportions can be measured in various ways (see "colorimetric purity" and "excitation purity"). Note 3 to entry: This entry was numbered 845-03-46 in IEC 60050-845:1987.
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