[Jewelry making - Article 00390] - Re: [Orchid] Fire scale Prevention During Vacuum Casting

[Volpe, Constantino]

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    James, It is the silver that has the affinity for oxygen. The reason
    you don't see fire stain in fine silver is that the fire stain  is
    oxidized copper. The oxygen in the silver will find the copper and
    oxidize it. 

Tino Volpe  Metallurgist, Technical Manager 
Tiffany & Co.  300 Maple Ridge Drive  
Cumberland, RI 02864-8707  401-288-0124
Constantino.Volpe AT Tiffany.com


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