[Jewelry making - Article 00745] - Re: [Orchid] Why does my gold BOIL?

[Goldwerx]

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>         And have had frequently got about 4 ounces of gold half melted,
>     when it starts boiling, while the other half is still 'congealed'.
>     In other words, the lump in the middle of crucible is surrounded by
>     boiling gold. 

    Gold boils at over 5000 degrees F, so I doubt that you are boiling
    it. I would suggest that you are dealing with dissolved gasses,
    oxygen comes to mind. I have noticed in particular, that old gold
    sometimes blisters and "boils as it melts. I don't know if that is
    because over time it has absorbed that much oxygen, but it wouldn't
    surprise me. When I have this problem, which is rare, as I usually
    work relatively new gold, I will over heat the melt until I am sure
    that I have driven off the zinc and add new. Not the perfect solution, 
    but it works for me.


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