[Jewelry making - Article 00392] - Re: [Orchid] Sparex No 2 101

[Helen Hill]

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    As John pointed out yesterday, I can't see why copper sulphide would
    be produced at all! Sulphuric acid in solution produces H+ (acidic)
    ions and SO4- (sulphate) ions. The copper in the vessel will react
    with the sulphate ions to give the blue solution of copper sulphate.
    It may well be that a high concentration of copper sulphate crystals
    on your lid take on a greeny turquoise colour. 

    Copper sulphide is grey-blue to black but I can't see where you'd
    get sulphide from. You WILL get copper sulphate which is the
    beautiful turquoisey blue colour. 

Helen
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