Poisonous or unpleasant substance added to alcoholic cosmetics to make them undrinkable.

any substance that serves as a denaturing agent

a substance added to intoxicating liquids such as alcohol , so that while they are rendered unfit to drink are still usable in industry

A chemical agent which disrupts protein structure, causing it to unfold. Denaturants are often used to dissolve aggregates and/or inclusion bodies, and include salts such as guanidine hydrochloride, organic agents such as urea, and also detergents such as sarkosyl.