Opposite of 'contaminate'

Contaminate (transitive verb) means "to add a little bit of bad stuff to (something), rendering it bad". Or thereabouts.

Is there a word for "to add a little bit of good stuff to (something), rendering it acceptable, not bad"?

Or, less optimal, an intransitive verb, or a noun describing the action?

Solution 1:

Perhaps remediate.

But it depends on the "good stuff" that's being added.

Other possibilities:

strengthen

rehabilitate

I also like @Kevin's fortify and purify from @MrHen's list.

I think nearly all of @F'x's suggestions are good, and @nico's answers are super-dope as well.

Solution 2:

You could use to enrich, to supplement, to ameliorate.

In certain contexts (e.g. metallurgy or electronics) you may also use to dope (e.g. doped semiconductors).

Solution 3:

Fortify. As in "fortified with vitamins and nutrients."

Solution 4:

To enhance, to improve, to better, to augment, to boost, to refine, to purify, to strengthen.