Circular 21 - Insecticides and SidDsidiary Materials 60 
safe place away from foods. Tight containers 
plainly labeled and marked poisonous should 
be used for storing the material. The dust 
should not be inhaled and the skin, especially 
open wounds, should be protected from the 
material or serious poisoning may result. 
This insecticide may be purchased in 
$00-pound barrels, drums, 100-pound kegs, 
bottles, and tins. The price in drums and 
kegs varies from 24 to 2? cents per pound. 
Available on contract: see- Class 51, 
General Schedule of Supplies, Procurement 
Division, Treasury Department. 
PENTACHLOROPHENOL 
Pentachlorophenol (C^^ClcOH) is one of 
the most effective chemicals for use as a dip 
in preventing and checking Lyctus powder-post 
beetle infestations in seasoned wood. It is 
a valuable chemical for preserving wood and 
other products and for the control of slime 
and algae. 
Pure pentachlorophenol is a white, 
needle-like, crystalline material which when 
hot has a very pungent odor. It is almost 
insoluble in water but soluble in alcohol, 
ether, benzene, and oil. The crystals are 
available commercially and should be dissolved 
in a light fuel oil. It is also available in 
liquid form already mixed by the manufacturer. 
Caution ; Care should be taken to 
observe the precautions mentioned by the 
manufacturer in handling it, otherwise it is 
likely to irritate the skin. Rubberized 
