[Jewelry making - Article 00849] - Re: [Orchid] Experimenting with granulation

[leonid surpin]

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>     I do not know about gum arabic, copper carbonate, or black copper
>     oxide. I have successfully granulated with fine silver and I
>     followed a multi-step process similar to the one outlined by Ronda
>     Coryell in her DVD The Art of Granulation 

    I have never seen the DVD by Ronda Coryell, and granulation does not
    excite me as an art form, but I am familiar with the technique. 

    To Richard: gum arabic and copper carbonate is all you need. The rest
    is practice. 

    <> 

    Granulation is based on the observation when copper is added to gold
    or silver, the temperature of resulting alloy will be lower than
    original alloy. That is only true up to either 24% or 28% of the
    copper. I do not remember exact number, and I am too lazy to look it
    up. 

    Copper carbonate, if heated with reducing flame, would convert to a
    pure copper. Pure copper in contact with gold or silver would form a
    solder with a lower melting point, and that will secure the granules. 


    Gum arabic holds everything together, while the process is going. 

That is granulation in the nutshell.
Leonid Surpin.
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