[Jewelry making - Article 00771] - Re: [Orchid] Staining Sterling Silver a Green Color

[jelf0]

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>     I use ammonium sulfate as a fertilizer in my garden. Is this the
>     same as ammonium polysulfide? If so, it can be purchased at any
>     garden center. 

    No, it is not; ammonium sulphate is sold as colourless, odourless
    crystals. They are highly water soluble, and not particularly
    poisonous. Ammonium polysulfide is a dark orange brown liquid,
    yellow in small droplets, smelling strongly of rotten eggs and is
    considerably more poisonous, requiring good ventilation if you do
    not want a headache. Another name for it (though not sanctioned by
    the chemists) is ammonium hydrosulfide. There is no simple method of
    making the polysulfide from the sulphate, although I have read you
    can make it by dissolving sulphur powder in ammonium sulphide
    solution. And ammonium sulfide is made by dissolving hydrogen
    sulfide gas (very poisonous!) in aqueous ammonia solution. 


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