complementary colour

noun

one of any pair of colours, such as yellow and blue, that give white or grey when mixed in the correct proportions

A “complementary colour” is one which produces white when mixed with another (see Colour).

The first two are due to the sensory apparatus, its optical laws of continued impression and complementary colour.

If we deduct the last measures from the first, the difference of aperture will give the complementary colour.

It will then be found that the colour is the same as the complementary colour, much diluted with white light.

Blue, as the complementary colour to yellow, is here absorbed, and hence the more energetic action of the blue rays.

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