[Jewelry making - Article 00090] - Re: [Orchid] Etching detailed patterns

[Tony]

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>        BTW How do you dispose of the nitric acid when you are done?  I
>     hate to pour it down the drain." 

    1 Add scrap copper to it and let it sit until there is no more
    action. Allow the water to evporate and you have copper nitrate. Very
    useful in mixing with glues to enable granulation. 

    2 Add chips of marble  or bicarbonate of soda to it until there is no
    more action. Let the water evaporate and then put the residue into
    the sweeps bin - the silver in the silver nitrate can be regained by
    your dealer. 

    Tony Konrath 
 

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