[Jewelry making - Article 00634] - Re: [Orchid] Alum - broken drill bits?

[jesse brennan]

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    The term alum  is a very generic term  for  a sulfate salt. You
    probably already have what you need-- Your pickle. a sulfuric acid
    or a  Sodium bisulfate ( Sparex or pH down) pickle will
    preferentially pick up iron If you pickle  your piece containing a
    broken drill or tap in old pickle containing copper you will dissolve
    the iron and plate out the copper.  In a new pickle solution you
    will just dissolve the iron and leave the silver alone. 

    The common cucumber  pickle solution used to contain aluminum alum
    but what you will find today in a grocery or drug store will usually
    be Ammonium alum. 

jesse

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