Student's text-book of color ; or, Modern Chromatics, with applications to art and industry (1908)
Rood, Ogden N. (Ogden Nicholas), 1831-1902 · New York : D. Appleton and company · leaf 142
to the black and white disks ; and these last can be arranged so that the grey furnished by them is as luminous as that given by the other two. ^ In an experiment of this kind it was found that to produce a pure grey it was necessary to take 36 parts of vermilion and 64 parts of bluish-green. This… … Fiq. 53.— Large Disk of Red and Blue-green arranged for the Production of a Pure Grey, Small Disk of Black and White furnishes the same Grey. form grey. All this can be put in the form of an equation by writing 36 red + 64 blue-green = 21*3 white + 78*7 black. We have here expressed the proportions…
Color · Painting
Internet Archive · Harold B. Lee Library · Public domain (published before 1931). Free to use for anything.
