[Jewelry making - Article 00576] - Re: [Orchid] Oxidation or patination?

[Bill Bedford]

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>             Is it more likely that this was caused by acid and other
>     chemical residues (which there are a LOT of, most involving sulfur)
>     on and inside the copper pieces that diffused through the water
>     resulting in patination of the copper surface.... 

    Most likely sulphur 

>             OR is it more likely that this sort of irridescence would
>     be caused by "oxidation", which when used by these folks means
>     exposure to plain water or humidity (but which when used by ME
>     means exposure to oxygen or normal atmosphere that results in a
>     usually  gradual change to the surface of the metal, typically
>     greenish for copper and ugly black/grey for silver)? 

    This is also caused by sulphur in the air. If you are anywhere near
    a coal or oil burning heater then you will get some air borne
    sulphur. 

Bill Bedford

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