[Jewelry making - Article 00344] - Re: [Orchid] Fire scale Prevention During Vacuum Casting

[Bruce Holmgrain]

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>         Is it the silver that has a high affinity for oxygen or the
>     copper part of a sterling alloy? 

    Silver doesn't oxidize, but oxygen will dissolve into it as CO2 will
    dissolve into water. You may note sometime in the future find that
    your fine silver is bubbling when it is molten. My understanding is
    that this is dissolved gasses escaping, particularly oxygen. 

    Many thanks to Tino, as I got a whole new perspective from your
    explanation in regard to casting.

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