Colour : a text-book of modern chromatics with applications to art and industry (1904)
Rood, Ogden N. (Ogden Nicholas), 1831-1902 · London : Kegan Paul, Trench, Trübner · leaf 178
MODERN CHROMATICS. 168 that 50 parts of red were neutralized by 31 parts of emer- ald-green and 19 parts of artificial ultramarine-blue ; the three colours gave a grey identical with that furnished by 13 parts white and 87 black. Putting this in the form of an equation, we have : 50 red + 31 em.… … Fig. TO. — Emerald-green and Ul- F'G. 71.— Disks of Emerald -green and Ultramarine-blue arranged tramarine-blue Disks arranged so as to neutralize lied and pro- so as to give a Colour Comple- duce with it a Pure Grey. Cen- mentary to lied. tral Black and White Disk for the production of a Pure…
Color
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