[Jewelry making - Article 00118] - Re: [Orchid] Tumbler turning jewelry black

[Peggy E. Pollak]

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    I've had this happen whenever I tumble cast pieces where there is
    the tinyest but of investment left. It wasn't just that the tumbler
    was black and the jewelry coated, the "liquid" in the tumbler was a
    viscous black goo. I got it off the jewelry by heating the pieces
    with a torch and pickling them. Then tumbled again after the tumbler
    and shot were cleaned.
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