[Jewelry making - Article 00136] - Re: [Orchid] Preventing Argentium Sterling Tarnish

[Eileen Procter]

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Hi Allan,

    Ammonium polysulphide is a mixture of 8% ammonia and 22-30% sulphur.
    It is basically liver of sulphur with some added ammonia. Kathy
    Palochak posted a silver pattination recipe using both of those and
    some salt. It should give you the same colours as seen in the CATRA
    photographs. The patina is reasonably stable. 

    Thioacetamide is a 2-carbon chain with a nitrogen and a sulphur atom
    on one end. I've never used it but the Merck Index cites it as a
    "pleasant substitute for H2S in laboratories". H2S, hydrogen
    sulphide, is rotten egg gas. 

Hope this helps
Eileen
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