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I just looked at the one i have at home too and it also says ammonium alum. Whats the difference anyway? Is ammonium alum really bad for the skin? Either way, i picked up the spray that's made with...

i was at the store today. the regular crystal stick is made with ammonium alum and the spray is made with potassium alum.

the spray or the actual crystal?

Am i wrong to think that i could use this instead of an alum block? i already use it as a deodorant and i think (or hope) that it works fine. I think its the same material/crystal and for some reason...