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Ammonium Alum.

Or if you were inquiring as to brand I got the Crystal Deodorant.

If I lick it I'd get the pucker you're talking about. But just the drip on the lips, doesn't bother me in the...

Am I the only one who doesn't mind the taste? I wouldn't chow down on a block but it has a kind of lemony Angostura taste. But I also pound back gin and tonics dosed heavily with Angostura bitters...