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By Janice C. 09/18/2006
Ask a jeweler if it can be re-dipped.
By Qryztufre 09/14/2006
look closely to see if the black stops are pitting (little holes in the silver plate). If that is the case there is likely no chance of "polishing" them away.
You may be able to fill them, but I've no real clue how...
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