[Jewelry making - Article 00724] - Re: [Orchid] A dark stain on a gold ring

[SBurns]

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    I've seen instances where a "stain" is formed by using a worn
    washout rack where the coating splits and the metal becomes exposed,
    and said rack is stood in an ultrasonic bath for many minutes. The
    stain forms at the point of contact. It takes repolishing that spot
    to remove the stain. Steve Burns


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