Church, A. H. (Arthur Herbert), 1834-1915 · London : Cassell, Petter, and Galpin · leaf 56
es, however, arise when such pigments as those above referred to are illuminated by artificial light, or are mixed with others to form second¬ ary and tertiary colours ; the anticipated result being oc¬ casionally very far from being realised. Cobalt blue reflects much green and violet light, as… … Fig. 19. the purity of the resulting colour, which is much greyer than one would have expected. By lamp-light cobalt-blue appears violet. Prussian-blue and indigo absorb most of the red, orange, and yellow rays, but emit a very large part of the green, blue and indigo. A crystal of blue vitriol…
Color
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