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Re: [Orchid] Rust Removal  
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From: David L. Huffman
Date: Tue Jul 12 20:53:01 2005
 
     
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>         My question now is: What exactly is the black coating and how
>     can it be removed? Herb McQuarrie 

    Hello Herb; I'd suggest that before you begin the stripping
    operation, you physically remove as much loose rust as possible with
    a wire brush.  Strip the article for a while, then rinse and wire
    brush, then continue stripping.  As far as I know, the black coating
    is another form or iron oxide, but one that does not bond as tightly
    to the iron as the red variety.  I'm never sure of the chemistry,
    ferric oxide, ferrous oxide, etc.  Perhaps some of our resident
    chemists can help. 

David L. Huffman

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