[Jewelry making - Article 00810] - Re: [Orchid] Why does my gold BOIL?

[Jeffrey Everett]

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    Huh, Interesting. And I got this data straight from the manufacturer
    of the super-white nickel gold (AAAPM). They told me to switch from
    propane to hydrogen for the best results. A number of people, (Marc
    Robinson being one of them) told me to use hydrogen-oxygen for
    casting, which is also what we used at Nielson's in Seattle back
    when... I wonder what the difference was in our techniques. I use a
    large melting torch with a large rose-bud type orifice a pre-heated
    crucible, and a relatively soft brush flame. I simply don't see
    porosity in my castings, micro-fine gas, hot or cold tear porosity or
    otherwise. What you say makes sense though. I don't know what to
    say. 

    I've always send out palladium-gold alloys to be cast by induction
    melting, which is how we cast it back in the 80's (Aurum induction
    casting machine). I noticed that torch melted pall-au cast from a
    crucible used for yellow golds turns out slightly off color. 

    I simply don't torch melt rose golds. Even certain higher cu content
    yellow golds (deep color) don't torch melt well, I have to melt them
    with constant stirring to avoid overheating the copper if torch
    melting. 

    Thanks for that information, I'll keep it in mind. 

Jeffrey Everett


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