822 Wisconsin Academy of Sciences, Arts, and Letters. 
Cyanormclurin 
Cyanomaclurin was isolated by Perkin and Cope, * 1 in 1895, 
from Artocarpus integrifolia, where it exists along with the yel¬ 
low pigment morin. Cyanomaclurin crystallizes in colorless 
crystals which dissolve in sulphuric acid with a beautiful crim¬ 
son color. Ferric chloride colors an aqueous solution of cyano¬ 
maclurin a deep violet color. Dilute alkaline solutions, dis¬ 
solve it with a deep indigo blue color which on standing changes 
to green, then brown. It does not combine with mordants to form 
a dye. 
Cyanomaclurin 2 is isomeric with catechin. It is probably a 
catechin in which the catechol nucleus is replaced by resorcinol. 
II. B. Pigments referable to diphenyl ethane. 
Of the pigments of known constitution only one, Genistein, 
is believed to be referable to diphenyl ethane. 
Genistein. 
While the constitution of genistein has not yet been fully de¬ 
termined it is believed by Perkin and Newbury 1 to be represented 
by the formula 
(OH), C 6 IP /°^CH C, H, OH 
' 
II 
o 
Genistein has been isolated, along with luteolin, from the 
leaves of Genista tinctorial It crystallizes in colorless ileedles. 
To fabrics mordanted with aluminum salts genistein imparts a 
yellow color. 
II. C.) Pigments referable to diphenyl propane. 
Three pigments, or pigment forming substances, of known 
constitution are referable to diphenyl propane. These are 
phloretin, butin, and saponarin or vitexin. 
1 Jr. Chem. Soc., 67, p. 939. 
1 Proc. Chem. Soc., 15, p. 179. 
2 Proc. Chem. Soc., 18, p. 138; 20, p. 170. 
2 Jr. Chem. Soc., 75, p. 832; 77, p. 1310. 
