Re: What kind of Alum?

Sil Horwitz (silh@iag.net)
Mon, 22 Jul 1996 13:20:53 -0400

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>Could someone tell me whether the alum used in food (pickle) preparation is
>Potassium alum or Chrome alum? For some reason I have a lot of those (food
>alum) around, so I don't want to buy the same thing again.

Neither. It's usually Ammonium Alum. And I'd keep away from that stuff; it's
very prone to break down and provide you with some nice ammonia gas! Stick
with photo quality potassium or chrome alum, as the formula specifies.

Sil Horwitz, FPSA
Technical Editor, PSA Journal
silh@iag.net

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