Abstract
(1) From spectral reflectance curves of 631 individuals of three ethnic groups (colour-coded as white, brown and black) the lightest, darkest and several intermediate individuals were selected for reflectance studies with X, Y and Z filters to plot a colour definition in terms of hue, saturation and luminosity from the CIE chromaticity chart. (2) These values were presented as a three dimensional model. (3) From this study the <i>hue</i> of all skins were red, and the differences were due to differences in <i>luminosity</i>. Brown skin was the most <i>saturated</i> red, and saturation decreased towards white and black. (4) The conceptual significance of colour specification is considered in relation to the epidermal melanin unit and the phenomenon of dichroism.
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