[Jewelry making - Article 00808] - Re: [Orchid] A dark stain on a gold ring

[Bruce Holmgrain]

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    A quick test might help. Have you dropped some nitric acid on the
    spot to see if you get a reaction? If it foams green, it is
    undisolved copper. 

    On a couple of occasions, I have not completely melted my alloy when
    casting an object or ingot. This may not become obvious for weeks or
    even months. 

    If it is undisolved alloy, disolve it out with nitric acid and weld
    in new metal. 

Bruce


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