[Jewelry making - Article 00241] - Re: [Orchid] Fine gold colouring on lower carats

[brainnet]

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Hi Nilesh,

>         Could someone please elaborate the Pottassium
>     Nitrate/Alum/Salt method. Am  I correct when I understand that it
>     is a surface depletion process?. 

    In 1989/90 I did an extensive research project compiling lists of
    different approaches to depletion gilding, which is published here
    at the Ganoksin project: 

    http://www.ganoksin.com/borisat/nenam/depletio.htm 

    This is one of the many approaches that goldsmiths have used to
    enrich the surface (and even refine) gold alloys. Varying mixtures
    of these three chemicals are widespread worldwide among goldsmiths
    for this purpose. 

best
charles

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