Circular 21 - Insecticides and Subsidiary llaterials 54 
The strong odor of naphthalene may be 
disagreeable but is not considered dangerous 
and presents no fire hazard. 
Caution ; It should not be used as a 
fumigant for grains, cereals, and other food 
products because it iraparts very persistent 
odors and flavors. 
Naphthalene flalces or balls may be 
obtained in 180- or 200-pound barrels, 50- 
pound cases, and smaller containers with the 
cases, at a price of 8^ cents, and l6-ounce 
packages at 8^ cents per pound. 
Available on contract: see Class 51, 
General Schedule of Supplies, Procurement 
Division, Treasury Department. 
NICOTINZ SULFATE 
Commercially available nicotine sulfate 
(a solution containin.'- the equivalent of ^0 
percent of nicotine) is mixed with water and 
used as a spray for killing wood ticks on 
vegetation. 
A commercial solution of nicotine sul- 
fate, ({Cq^qH^L^No ) .H2S0^), is a dark brovm or 
blackish, poisonous lio.uid with 
a strong penetratin,; tobacco-like odor. It 
is somewhat heavier than water and will 
readily mix with it. Nicotine sulfate is 
used extensively as a contact insecticiae 
for spraying aphids and other soft-bodied 
sucking insects on pl;^.nts. Black Leaf 40 
is the trade name of a widely distributed 
coraiuercially prepared nicotine sulfate. 
