Ridgway, Robert, Color standards and color nomenclature

(Washington, D. C. :  The author,  1912.)

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26       Color Standards and Nomenclature.

DYES and pigments USED IN THE PREPARATION OF THE
MAXWELL    DISKS,    REPRESENTING    THE    THIRTY-
SIX COLORS OF THE PURE SPECTRUM SC.ILE,
FORMING THE BASIS OF THE COLOR-
SCHEME    OF    THIS   WORK.*

Red.—Devoe's geranium lake (dry), its orange hue
neutralized by a wash of rhodamin b. {Crocein scarlet b.
washed with rhodamin b. produces practically the same
fine red.)

Hues between red and oraaqt. — Crocein scarlet b. with

gold ora?ige.

Orange.—Gold orange with orange g.

Hues between orange and yellow.—Orange g. with auramin.

Yellow.—Auramin, rather dilute. (The best substi¬
tute among pigments is a fine quality of zinc yello-ai, as
Hatfield's.)

Hues between yellow and qrttn.—Auramin washed with

light gree?i.

Green.—Auramin (very dilute) washed with light
gree7i. (The auramin should be applied first, because
it "sets" or becomes fast quickly, while the light green
does not, but is largely removed by overwashes of the
yellow, thus rendering it very difiicult to get the desired
hue.)

Hues between green and blue.—Methyl green; the same

washed with light blue (Diamond Dye); for the hues
nearer blue, light blue washed with Winsor and New¬
ton's pertnaneyit blue or new blue (the least violet-hued
of the artificial ultramarines).

Blue.—Light blue washed with perma7ie7it blue or new
blue. (Although the color is nearer that of the artificial
ultramarines named, it is useless to apply the latter first,

*The aniline or coal-tar dyey named are all of the manufacture of Dr. G. Griibler
and ft)., Leipzig, Germany, unless otherwise staled,    (.^cc Preface, page ii.)
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