[Jewelry making - Article 00073] - Re: [Orchid] Cleaning a file

[FrodoGem]

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>     Clean the file in a hot washing soda bath with a brush, or use an
>     other way of decreasing. Than put them in the following mixture: 7
>     parts water 3 parts sulphuric acid (H2SO4) 1 part Nitric acid.
>     (HNO3) In a few minutes ready. Neutralize in washing soda again. 

    How important is the degreasing to prevent the formation of
    explosives?  I'm not sure of the concentrations involved but know
    that nitric acid and sulphuric acid together are the basis for
    making explosives from many organic materials. Nitroglycerine, TNT,
    Nitrocellulose etc.  The diprotic sulphuric acid gives the nitric
    the oomph it needs to react with the organics. Would contamination
    with lubricants, etc be a risk at these concentrations of acid? 

Howard Woods
Eagle Idaho

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