Examples from the Web for adulterant
In this bulletin they do not classify saltpeter as an adulterant.
This oil, which has what is generally termed a "tea-rose odour," is occasionally used as an adulterant for otto of rose.The Handbook of Soap Manufacture|W. H. Simmons
In moderate amounts it is not generally considered an adulterant.
Nitro-benzene has been used as an adulterant of bitter almond oil, but the detection is easy (see “Foods,” p. 551).Poisons: Their Effects and Detection|Alexander Wynter Blyth
This oil, however, varies in purity, the purest being used as an adulterant of olive oil or as a substitute for this oil.