[Jewelry making - Article 00369] - Re: [Orchid] Tumbling with walnut shells

[R . E . Rourke]

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    coral is going to be tricky.. I posted the walnut shell (crushed
    finely) tip regarding a way not to remove as much oxidation from
    sterling as typical abrasives. I think if you call Thunderbird
    supply, that manufactures compounds of all grades, types etc, and ask
    them to supply you some powdered samples to come up with the best for
    charging.. otherwise add a bit of cerium oxide to the hulls (i do
    hope you have very finely crushed grade, not like available at garden
    centres), or take some zam and crush and add it to your hulls..rouge
    is iron oxide (if we are talking about the same creature) and may
    damage instead of finish he coral.also you must avoid acid burnishing
    compounds and those that contain sodium thiosulfate as they are also
    detrimental to coral, nacre, and other delicate substances used in
    jewelry
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