[Jewelry making - Article 00343] - Re: [Orchid] Alum in israel

[jesse brennan]

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    Alum is a generic term for  many sulfate salts: 

    Classicly  alum was (is)  Aluminum sulfate , Al2(S04)3-18 H2O 
    called papermakers alum.  or Aluminum potassium sulfate  KAl (SO4)2
    -12H2O or Sodium aluminum sulfate, NaAl(SO4)2-12 H2O,  this is
    mostly used as a leavening agent in bread (baking powder).  There
    are other industrial uses  as a coagulating agent in water
    purification or waste  water.treatment  etc. 

    I notice that the  cucumber  pickle  alum in local markets is now
    Ammonium sulfate.    It  can also be a sulfate salt of other metals.
    Confused ???   Me too,  as I don't know  that it really makes any
    difference  which is best used as a metal pickle  and I am a
    chemical engineer. 

jesse



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