Which preposition to use with adulterate

with Occurrences 17%

It is sometimes adulterated with rice-flour, as the black is with burnt bread.

by Occurrences 1%

To whatever country they went, their own tongue was adulterated by mixing with the people there; and there were many who, after an absence of ten to five years, from some cause or other, returned to Dilli, and stayed there.

in Occurrences 1%

Chinese tea has frequently been adulterated in this country, by the admixture of the dried leaves of certain plants.

to Occurrences 1%

Between 1450 and 1575, Western Indian painting continued to focus on Jain themes, adulterated to only a very slight extent by subjects drawn from poetry.

Which preposition to use with  adulterate