[Jewelry making - Article 01268] - [Orchid] Blue acid?

[will and julia]

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Hi all,

    I work in a pawn shop, where we use nitric acid to determine whether
    something is gold or not. It's in a little glass acid jar with a lid
    and a stick. Recently it has turned a lovely turquoise blue color.
    Why is this?  I figured maybe someone dropped a bit of metal in it or
    something. Does anyone know if the color change will affect its
    usefulness? I don't want to neutralize it and throw it away if it's
    only a cosmetic problem. 

    Please respond off-line, I have rarely had the luxury of enough time
    to read the whole list daily recently! 

Thanks a lot, y'all!
Julia Newton
Willandjulianewton AT hotmail.com

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