Circular 21 - Insootioides and Subsidiary Materials 13 
Carbolic acid is obtained from coal tar, 
and the commercial form contains at least 98 
percent phenol (C6H5OH). It is a white, crys- 
talline mass which reddens on exposure to air 
and has a characteristic coal-tar odor. It is 
very soluble in alcohol, chloroform, carbon 
disulfide, and peti*oleu:a. Carbolic acid has 
many. uses »in medicine and industrially, also 
as a general disinfectant. 
Caution ; Since carbolic acid is poison- 
ous and very caustic, great care should be used 
in handling it. Do not handle with bare hands. 
It should be kept well closed and protected 
from li,<::ht. 
■ o-" 
This chemical is obtainable in 100-pound 
carboys, in 850-pound drums, at 12^ to I4 cents 
per pound. 
Available on contract: See Class 51, 
General Schedule of Supplies, Procurement 
Division, Treasury Department. 
CARBON DIOXIDE 
Carbon dioxide as a liouid is used in 
combination witn ethylene oxide for the fumiga- 
tion of cured meats, clieese, grain, and house- 
hold furnishings. As a solid, dry ice, it is 
used to chill cans of hydrocyanic acid discoids 
before f^omigation to retard the evolution of 
the gas and thus increase the safety of their 
use. 
Carbon dioxide (CC2) is a colorless 
liquid condensed froii a heavy gas called 
carbonic acid gas v;hich is produced by the 
action of acids on carbonates, by the 
