Circular 21 - Insecticides and Subsidiary Materials 71 
SODIUI.I BICARBONATE 
Sodium bicarbonate has no direct 
entomological uses but it is employed as a 2 
percent solution in an eye wash to relieve eyes 
affected by chloropicrin if the latter chemical 
accidentally reaches the eyes as in fumigation 
operations. 
It is a white, crystalline salt, NaHC03, 
found in many mineral springs, and produced 
artificially by treating the normal carbonate 
with carbon dioxide, and, in the Solvay pro- 
cess, as an intermediate product. It is used 
in cookery, in baking powders, and in medicine. 
This material may be obtained at any 
drug or grocery store. It is available on 
contract: see Class 51, G-eneral Schedule of 
Supplies, Procurement Division, Treasury 
Department. 
SODIUIvI FLUORIDE 
This poisonous powder is considered as 
one of the best all-round cockroach remedies. 
Sodium fluoride when dusted in their runways 
will sometimes drive them av/ay. The commer- 
cially available product and commonly employed 
grade of the powder contains 94 to 97 percent 
sodium fluoride. 
Sodium fluoride, NaF, is a v^ite, very 
poisonous powder soluble in water but insol- 
uble in alcohol. It is sometimes used medi- 
cinally and for the preparation of pastes, 
and for disinfecting fermentation apparatus 
in breweries and distilleries. 
