Denatured Alcohol

From Distillers Wiki

Denatured alcohol (or rubbing alcohol) is alcohol which has been rendered unpotable by the addition of methanol or some other harmful or aversive substance, such as denatonium benzoate. The process of doing so is called denaturing.

Denatured alcohol should not be redistilled to make potable alcohol because other substances are added to the alcohol which require vacuum distillation setups which can cost more than six figures in order to separate. In fact, many rumors of moonshine causing blindness were founded upon distillers trying to make drinkable alcohol out of denatured alcohol, or the adulteration of the spirit with it.

See the Wikipedia article here [1]