Adulteration

n. process of adulteration; substance that has been made impure

Adulterants are chemical substances which should not be contained within other substances (eg. food, beverages, fuels or pesticides) for legal or other reasons. Adulterants may be intentionally added to substances to reduce manufacturing costs, or for some deceptive or malicious purpose. Adulterants may also be accidentally or unknowingly introduced into substances. The addition of adulterants is called adulteration.
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Adulteration /adul·te·ra·tion/ addition of an impure, cheap, or unnecessary ingredient to cheat, cheapen, or falsify a preparation; in legal [more]Adulteration - Community and Resources

Noun
1. being mixed with extraneous material; the product of adultering
(synonym) debasement
(hypernym) impurity, impureness
2. the act of adulterating (especially the illicit substitution of one substance for another)
(hypernym) change

n. adulteration, substance that has been made impure