The fluoborates when fed in powdered form were found to be non-toxic to both rats and insects. In solution enough fluorine is liberated to produce toxic effects.
Both aluminum sulphate and hydrated lime are capable of saving animals from a lethal dose of sodium fluoride when mixed with the latter. Boric acid also has some value as an antidote through the formation of a fluoborate. The aluminum sulphate forms cryolite which was found to be much less toxic. When aluminum sulphate is mixed with the sodium fluoride and used as a roach powder, a lower kill is obtained than with sodium fluoride alone.