[Jewelry making - Article 00122] - Re: [Orchid] Etching detailed patterns

[John Burgess]

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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.  I have been storing it in a jar
>     until I can find out where to dispose of it. 

    G'day 'Polymaid';  You can dispose of nitric acid by first
    neutralizing it with sodium bicarbonate - baking powder, or sodium
    carbonate - washing soda - until there is no more fizzing. Mix it
    with some inorganic material such as sand or even dry soil, but DO
    NOT use sawdust or shavings, for there is a possibility of it
    igniting spontaneously.    Spread the sand/neutralized mix on a non
    metallic surface - heavy polythene is OK - and allow it to dry
    thoroughly in the sun (if there is any where you are!).   Simply
    bundle it up and dispose of it in the usual way of solid waste.   It
    will contain sodium nitrate which is used as a fertilizer. -- Cheers
    for now, John Burgess;   johnb AT ts.co.nz of Mapua Nelson NZ 

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