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Blueing Appearance
It's been my experience that this happens because there is more than 1/2 of 1% silicone in the steel. As I understand it, the silicone is added to make the steel easier to work. I've seen this on everything from Topper shotguns to Desert Eagles. When I hot blue, if I up my working temperature from 285 degrees to 305 ( I use Du-Lite Steelkote), this seems to cure the problem. Although, in reading the comments, plum is an acceptable color to a lot of gun owners. It does kind of add a nice old timey look.
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