Church, A. H. (Arthur Herbert), 1834-1915 · London : Cassell, Petter, and Galpin · leaf 31
a very respectable kind of whitish grey may be obtained by the use of fewer colours than seven ; but of this point we shall have occasion to speak more definitely further on. The best pigments, however, even when used in proper proportions, do not produce a perfect white when the disc painted with… … rays, and a grey is the result. If several series of similarly coloured segments be painted on the disc the grey more nearly approaches white. In the latter case the eye re¬ ceives simultaneously the impressions of the several colours, and so the effect does not wholly depend upon the long…
Color
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