Excerpt from Complementarism, Physical and Psychical
Furthermore, it may be said that the exact ascertainment of the complementary relations of colours has practically no meaning at all for the physicist; for thus far no fixed relation has been found between what he regards as colour wave length) and complementarism. With the help of a chart of the normal spectrum, it is found that the change in colour-quality in different parts is not directly proportional to the change in wave-length. So, too, Helmholtz has found that the relation which does exist is not a fixed one for all the different pairs of complementary colours, but that it varies considerably. The following table exhibits this variation as Helmholtz'l' ascertained it (the unit of length used being the micron)
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