26 Coeor Standards and Nomenceature. 
DYES AND PIGMENTS USED IN THE PREPARATION OF THE 
MAX WEED DISKS, REPRESENTING THE THIRTY- 
SIX COEORS OF THE PURE SPECTRUM SCAEE, 
FORMING THE BASIS OF THE COROR- 
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 orange.— 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 yellow , as 
Hatfield’s.) 
Hues between yellow and green —Auramin washed with 
light green. 
Green. — -Auramin (very dilute) washed with light 
green. (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 difficult to get the desired 
9 hue.) 
Hues between green and blue. — Methyl green; the same 
washed with light blue < (Diamond Dye); for the hues 
nearer blue, light blue washed wfith Winsor and New¬ 
ton’s permanent blue or new blue (the least violet-hued 
of the artificial ultramarines). 
Blue. — Light blue washed with permanent 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 dyes named are all of the manufacture of Dr. G-. Griibler 
and Co., Leipzig, Germany, unless otherwise stated. (See Preface, page ii.) 
