The basic colours are black and white (or, in a more generic sense, darkness and light) plus the primary colours, red, blue, yellow and green (yellow is primary for pigments, while it is green that is primary in terms of light refraction). These are supplemented by the colours which are obtained by mixing the primaries – orange (red plus yellow), brown (red plus green) and purple (red plus blue), plus those which involve mixtures with white, namely grey and pink.
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