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Old December 12, 2019, 01:37 AM   #2
44 AMP
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Join Date: March 11, 2006
Location: Upper US
Posts: 21,002
Bluing is a form of rust. The color comes from the chemicals used in the process. If done correctly the steel surface "rusts" (blues) to a certain point which then resists future normal rusting better than unblued steel.

It shouldn't "come off" but it can be removed. Regular gun oil shouldn't do it. Nor does the paper towel really matter. A rust remover "oil" could. Naval jelly will remove rust and bluing. There are other compounds that will also.
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