[Jewelry making - Article 00123] - Re: [Orchid] Coloring 18k yellow gold

[Peter W . Rowe]

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>     Either method leaves a surface layer of 24K  doesn't it? 

    Heating and then pickling usual karat gold alloys with sparex type
    pickles will remove copper oxides only.  since surface copper is
    oxidized in the heating, yo've effectively removed the surface
    copper, enriching to gold content at the surface.   But most gold
    alloys also contain silver.  The silver is not removed by this
    process.  Other acids and proceedures are needed if you want the
    surface to really be 24K. 

Peter



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