[Jewelry making - Article 00139] - Re: [Orchid] Depletion Gilding effects

[Alma Rands]

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    Hi Donna.  I have not done depletion guilding on 22K gold, but have
    done copper depletion on sterling in order to bring up the fine
    silver to the surface. When doing this process on silver, I heat the
    silver gently until it discolors, then  put it in the sparex pickle,
    until the silver is free of discoloration. I do this as many times as
    necessary---which will be determined by the fact that when heating
    with the torch, the silver no longer turns black. With gold, there
    may be two problems you are contending with. One is that  part of the
    alloy in the gold has zinc, or another metal which is incompatible
    with enameling. If the alloy is not the problem, it may be that you
    are not heating, picking, heating and pickling a sufficient number of
    times to rid the gold of the copper and thereby you are not bringing
    the pure gold to the surface. Perhaps some of the other enamelists
    may  have some other suggestions.  It might be a good idea to
    contact Tom Ellis or Bill Helwig at Thompson enamel for their advice 

  Alma

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