Circular 21 - Insecticides and Subsidiary Materials 40 
For manufacturers and distributors of 
hydrocyanic acid discoids, liquid hydrocyanic 
acid (HCN), and calcium cyanide, see number 
U of list at end of this circular. 
HYDROGEN P2R0XIDE 
Hydrop:en peroxide solution (USP) may be 
applied locally to the affected areas of the 
skin to relieve irritation caused by the bites 
of fleas and V arious other insects. For this 
purpose the common medicinal peroxide of the 
druggist is used, which is a water solution 
containing, 3 percent by weight of the peroxide. 
Hydrogen peroxide (HpOp) as a pure com- 
pound is a colorless liquid and, like water, 
is composed of hydrogen and oxygen, but in a 
different proportion. It is a common article 
of commerce, being available in a 3 percent 
and a 30 percent solution. It has many 
medicinal and industrial uses. 
Caution ; Hydrogen peroxide solution 
must be protected from the light, as in a brown 
glass container, to prevent decomposition of 
the compound, and should also be kept in a 
cool place. 
This material is available in barrels 
of 375 pound capacity, 8 pound jugs, 120 pound 
carboys, ranging in price from 3-3/4 cents in 
barrel lots and 16 to 18^ cents in carboys. 
It is also available in small sized packages 
at local drus firms. 
"■tj 
Available on contract: see Class 51, 
General Schedule of Supplies, Procurement 
Division, Treasury Department. 
