[Jewelry making - Article 00927] - Re: [Orchid] Retrieving silver from a nitric acid bath

[John Donivan]

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    I've never actually done it, but the book way that I learned when I
    did a little etching is to pour a solution of sodium chloride (table
    salt) into it. What happens chemically is that you create silver
    nitrate when you etch Ag+HNO3->H2+2(AgNO3). Silver Nitrate is
    readily soluble in water. When you add Sodium Chloride, the silver
    and the chloride combine - chloride will "grab" the silver away from
    nitrate. Silver Chloride is insoluble in water, and will precipitate
    out as a white powder. Pour it through a coffee filter, and
    apparently when you melt it it will decompose and you'll get a
    button of silver. This is out of a book or chapter about etching.
    Even if the melting isn't feasable, the precipitate contains your
    silver...

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