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Join Date: Jun 2003
Location: 5B wishing to be in 4B
To explain it to you the way I've always understood it...
Alum makes things "Shrink" it will also make thing coagulate...
so, in a jam or jelly, I guess what it is doing is making the jam/jelly Coagulate or Firm up?
If you ever have a ulcer in your mouth, take a dab of alum on your finger and put it directly on the ulcer, it will burn, but it shrinks the ulcer and makes it go away....when we would get an ulcer in our mouths at home, mom always got out the alum and had us dab some on the ulcer...ulcer was gone pretty much by the end of the day and no more pain from it!
Also, alum is used in Pickle making...it helps somehow to firm up the pickles, give them a crunch from what I understand of it's useage.... there are many useages for alum in older cook books, even used in making cakes!