[Jewelry making - Article 00158] - Re: [Orchid] PnP changing color

[James Binnion]

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>     When I use it I mix 1 part 35% peroxide (H2O2), 1 part conc.
>     hydrochloric acid (HCl) into 3 parts water. If you're used to
>     ferric chloride this mixture is several times faster on copper. It
>     is very corrosive. As always, if you don't know what you're doing -
>     don't do it. 

    35% H2O2 is very dangerous to handle. It is a verry different beast
    from the drugstore variety. I would not use it without extensive
    safety equipment and training. Below are two things to think about
    before using it from the Wikipedia entry on hydrogen peroxide. 

    "Hydrogen peroxide vapors can form sensitive contact explosives with
    hydrocarbons such as greases. Hazardous reactions ranging from
    ignition to explosion have been reported with alcohols, ketones,
    carboxylic acids (particularly acetic acid), amines and phosphorus.
    [citation needed] The saying is 'peroxides kill chemists'." 

    "Hydrogen peroxide, if spilled on clothing (or other flammable
    materials), will preferentially evaporate water until the
    concentration reaches sufficient strength, then clothing will
    spontaneously ignite. Leather generally contains metal ions from the
    tanning process and will often catch fire almost immediately." 

James Binnion
jbin AT mokume-gane.com
James Binnion Metal Arts
http://www.mokume-gane.com
360-756-6550
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