Color problems; a practical manual for the lay student of color (1903)
Vanderpoel, Emily Noyes, 1842-1939 · New York [etc.] Longmans, Green · leaf 205
Plate XXIII … SPECTRAL ORANGE AND ITS COMPLEMENT, GREEN-BLUE, IN THEIR RELATIVE PROPORTIONS The gray in the centre of this Plate is the gray produced by the above two complements when mixed on a color wheel, and corresponds exactly to the gray produced by the given amounts of black and white. (N. B. The above…
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