Circular 21 - Insecticides and 3ul)6idiary Maiterials 21 
Coconut oil soap (liquid) is a potash 
soap made from coconut oil and, as explained 
above, is useful in the preparation of emul- 
sions and as a spreader or wetter in spray 
combinations. Most soaps, including coconut 
oil soap, have value as contact insecticides 
against various soft-bodied insects when used 
at sufficient strengths. Other uses for coco- 
nut oil soap are for the preparation of 
shampoos, toilet soaps, and shaving soaps. 
For manufacturers and distributors see 
number 30 of list at end of this circular. 
COLLODION 
The application of collodion (new skin) 
to chigger bites is soothing. 
Collodion is a viscous solution of pyroxy- 
lin in a mixture of alcohol and ether, or a 
similar solution of pyroxylin in some other 
solvent such as acetone. It is used as a coat- 
ing for wounds, for photographic films, small 
balloons and membranes. 
The material is sold in 325 pound drums 
at 15 cents per pound, or in -^5 pound cans at 
19 to 20 cents per pound. 
Available on contract: See Class 51, 
General Schedule of Supplies, Procurement 
Division, Treasury Department. 
