Fraps, G. S. (George Stronach), b. 1876 · New York : Macmillan Co. ; London : Macmillan & Co. · leaf 271
PRINCIPLES OF DYEING 254 and is due to the combination of the rays of hght which both dyes transmit. The color of the dye, while a guide, is no certain index to its absorption-spectrum, since two yellows, for example, may appear exactly alike, and yet absorb different rays of light. Mixed with the… … Fig. 22. — Absorption spectrum of a yellow dye {A), a blue dye {B), and their mixture (C). as an aid in their mixing, but there are only two ways to ascertain the exact color which will be produced : an ex- amination of the absorption-spectrum of the dyes, or experi- mental dye-trials with the…
Dyes and dyeing
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