[Jewelry making - Article 01236] - Re: [Orchid] Ferric Nitrate Stain Removal

[jkbrennan]

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    I used to buy straight oxalic acid to originally to clean up the
    solid maple cutting block counter tops in my first house. (not maybe
    the best idea  but it worked) my source dried up and I used
    barkeepers friend. Zud  has  been working for me but the MSDS calls
    for 1 - 10 %  oxalic acid while barkeepers friend calls for 10 %.. ??
    I have  2 cans  of zud which work but maybe the sell different
    concentrations different places ??? 

    Lapidaries use  100%  oxalic acid for some mineral  polishing --the
    local people have a tough time getting it.. 

jesse


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