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Old June 27, 2012, 12:58 PM   #10
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Join Date: May 19, 2011
Location: Eastern IA
Posts: 428
Slow rust bluing is an old process where you let the exposed surface rust, usually by applying an acid to make it rust nice and evenly. After there's a nice even coat of rust, you boil the part, then scrub off the excess with a very fine wire brush or very fine steel wool. Repeat this process 5-7 times and you get a nice, blued finish. Like any bluing, metal prep is key.

Overall, it's not hard, but is pretty time consuming. Midway has a video showing the basic process:
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