Letter | Published:

Is Blue a Primary Colour?

Nature volume 5, page 25 | Download Citation



MR. AITKEN in his letter in NATURE, Oct. 12, seems to confound primary with pure colours; it is true they are pure in a certain sense, but in what sense is fully explained in Prof. J. C. Maxwell's lecture, given in NATURE, vol. iv. p. 13. All the experiments mentioned by Mr. Aitken merely prove that the blue colours we commonly see are mixed ones; but the same is the case with almost all the colours we see, while any tint of the spectrum, whether primary or not, may be had pure, i.e., consisting of homogeneous light. Likewise colours which appear just the same to the eye may be made of very different components.

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