[Jewelry making - Article 00851] - [Orchid] Micro pave going black when rhodium plated

[Chris Katsivelis]

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Looking for some advise please.

    An all white gold ring. 

    Micro pave set with approx 40.015ct dia's. After resizing we emery
    the entire ring to get all the old plating off. It is hollowed out
    in the back this is not touched. When we re-rhodium plate it the
    stones come out black. It doesnt look like the actual diamonds go
    black but the metal behind them. To get rid of it we gently heat the
    ring with a torch and its gone away after it comes out of the pickle.
    There are 2 rings of a similiar description that have the same
    problem. Any ideas on what might be causing this? We keep our
    solutions very clean and it even happened with new solution. 

Cheers
Christos
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