Free Acetic Acid ;-)

[Ric Brekne]

And here I thought we were talking about aspirin :)

anon
...............

Acetic acid is the active ingredient in table vinegar. It is completely
soluble (miscible) in water, ethanol, acetone, toluene, and others. It
is used in the darkroom as a stop bath, can remove scale from kettles,
and can be used to neutralize the sting of the box jellyfish.

-Mark Schecter