PRODUCTS AND THEIR APPLICATIONS. 93 
29. COLORING MATERIALS—Continued. 
b. Derived from birds: 
Shell of eggs, used for white eae 
Series of murexides, or purpurate of ammonia dyes, made 
from guano. 
e. Derived from fishes: 
(Essence @ Orient, or fish-scale pear], used as a pigment.) 
(Gall of carp, used in Turkey asa green paint and in staining 
paper.) 
d. Derived from insects: 
(Cochineal dye, from Coccus cacti of Mexico, used in manu- 
facture of rouge, of carmine, and lake pigments, and in 
coloring tinctures.) 
Canadian cochineal. 
(Kermes and other cochineals of commerce, Coccus ilicis.) 
(Lae dye and lac lake, from Coceus lacca, C. polonicus, C. uva 
ursi, and Ophis faba.) 
Dye prepared from bed-bug, (Cimex lectularius.) 
(Dye prepared from Trombidium, in Guinea and Surinam.) 
Nut-galls produced by insects, and used in tanning, for black 
dyes, for woolen cloth, silk, and calico, and in manufacture 
of ink and gallic and Ree acid, employed in photog- 
raphy. 
e. Derived from mollusks: 
(Sepia from Sepia officinalis.) 
Purple dyes from gastropods, Murex, Purpura, &e. 
Purple dyes from nudibranch mollusks. 
30. CHEMICAL PRODUCTS AND AGENTS EMPLOYED IN 
ARTS AND MEDICINE. 
a. Derived from mammals: 
Secretion of skunk. . 
Album grecum of dogs, used as a depilatory in tanning hides. 
‘Albumen of blood, employed in sugar-refineries, in certain 
cements and pigments, and as antidote and emollient. 
Dung, used in calico-printing. 
Gall of animals, used in mixing colors, in fixing the lines of 
crayon and pencil drawings, in preparing the surface of 
ivory for painting, in removing grease, and in medicine. 
Pepsine and pancreatine, prepared from stomachs of hogs and 
calves. 
