26 



Color Standards and Nomenclature. 



DYES AND PIGMENTS USED IN THE PREPARATION OP TH£ 

 MAXWELL DISKS, REPRESENTING THE THIRTY- 

 SIX COLORS OF THE PURE SPECTRUM SCALE, 

 FORMING THE BASIS OF THE COLOR- 

 SCHEME OP THIS WORK.* 



R e( ]__D eV oe'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.— 0<^m scarlet b. with 



gold orange. 



Orange.— Gold orange with orange g. 



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



\t\\W.— 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 

 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 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. Grubler 

 and Co., Leipzig, Germany, unless otherwise stated. (See Preface, page ii.) 



