Adulterator

a·dul·ter·ate  (-dlt-rt)

tr.v. a·dul·ter·at·ed, a·dul·ter·at·ing, a·dul·ter·ates

To make impure by adding extraneous, improper, or inferior ingredients.

adj. (-tr-t)

1. Spurious; adulterated.

2. Adulterous.

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[Latin adulterre, adultert-, to pollute; see al-¹ in Indo-European roots.]

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a·dulter·ation n.

a·dulter·ator n.

Synonyms: adulterate, debase, doctor, load
These verbs mean to make impure or inferior by adding foreign substances to something: adulterate coffee with ground acorns; silver debased with copper; doctored the wine with water; rag paper loaded with wood fiber.

Thesaurus

Noun	1.	adulterator - any substance that lessens the purity or effectiveness of a substance; "it is necessary to remove the adulterants before use" adulterant substance - a particular kind or species of matter with uniform properties; "shigella is one of the most toxic substances known to man"
	2.	adulterator - a changer who lessens the purity or effectiveness of a substance changer, modifier - a person who changes something; "an inveterate changer of the menu"