Color-blindness [electronic resource] : its dangers and its detection (1879)
Jeffries, B. Joy (Benjamin Joy), 1833-1915 · Boston : Houghton, Osgood ; London : Trübner · leaf 64
nous it is, but is at the same time less 'saturated,' more whitish. The yellow is, as it were, a combination of almost equal proportions of the fundamental colors that form white. Green is a strongly luminous but whitish green, which, in tending toward the blue becomes more and more ' saturated ; '… … higher degree than the normal. A violet strongly luminous is sufficient to induce this green ; but a feeble violet, although very sensible to the normal eye, is black to the color-blind in question. . .,. i " It is plain that the violet-blind, whose primitive colors are red and green, do not…
Color Vision Defects
Internet Archive · Wellcome Library · Public domain (published before 1931). Free to use for anything.
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