[Jewelry making - Article 00085] - Re: [Orchid] Coloring 18k yellow gold

[Beth Rosengard]

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    Hi Doug, 

>         I know there's a lot more science to this, but this is the
>     basics of how it works. 

    I know how it works (although that was a very nicely put
    explanation); what I don't understand is the necessity for some of
    the steps listed by David Huffman for depletion-gilding 18K yellow
    gold which don't seem to be necessary for 14K yellow when the aim is
    to get a surface as yellow as 24K. 

    In particular, why air cool before quenching (hot quenching is no
    problem with 14K)?  Why muriatic or other special acids (Sparex works
    fine with 14K)?  Why suspend in an ultrasonic (hot pickle does the
    job just fine)? 

    I realize that 18K yellow gold contains less copper than 14K but is
    that sufficient reason to necessitate such a specialized
    depletion-gilding procedure?  Either method leaves a surface layer
    of 24K  doesn't it?  so why go to the extra trouble? 

Beth


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