Wakeman—Pigments of Flowering Plants. 
895 
Brazilein occurs along with brazilin in various species of 
“red wood,” Cisalpinia. It crystallizes in microscopic reddish 
brown crystals with a metallic reflection. It is very slightly 
soluble in cold water, better in hot water. The solution is 
bright red with an orange fluorescence. It is soluble in alka¬ 
line solutions with a bright red color which turns brown upon 
standing in contact with the air. 
Brazilein dyes fabrics mordanted with aluminum a blueish 
red; with chromium, grayish brown to violet gray; with tin, 
orange red; with iron and aluminum mixed, a dark purplish red. 
Brazilein has been the subject of a large number of chemical 
investigations and a large number of derivatives have been pre¬ 
pared. 
Literature on Brazilein. 
Herzig, — Monatsh. f. Chem., 19, p. 739; 20, p. 461; 22, p. 207; 
23, p. 165; 25, p. 734; 27, p. 743. 
Kostanecki, — B., 32, p. 1042; 41, p. 2373. 
Perkin, — Proc. Chem. Soc., 22, p. 132; 23, p. 291; 24, p. 54,148; 
93„ p. 489, 1115; 95, p. 381. 
Liebermann, — Ber., 9, p. 1866. 
Scholl and Dralle, — Ber., 17, p. 375; 20, p. 3365; 21, p. 3009; 22, 
p. 1547; 23, p. 1430; 25, p. 18; 27, p. 524. 
Haematein. 
Haematein occurs in the “blue wood” of Haematoxylon cam - 
pechianum, forming the characteristic pigment of the logwood 
dye stuffs. It crystallizes in microscopic crystals of a reddish 
brown color with a yellowish green metallic reflection. It is 
very slightly soluble in water, difficultly soluble in alcohol, 
ether, and acetic acid, insoluble in chloroform and benzene. It 
is soluble in alkaline solutions, in sodium hydroxide with a bright 
red and in ammonia with a violet red color. It dyes fabrics 
mordanted with aluminum a grayish blue to black color; with 
iron, black; with chromium, blue black; with copper, greenish 
black and with tin, a violet color. 
