Chrome\Nickel 1912 Erfurt, First Luger.

[azrael_cervale]

Well I cleaned a section of the frame from under the grip with some hoppe's and then a little polish, and ran my blueing pen over it. The blueing seems to work. The one thing I don't know is what the pen would do to the surface if it were nickel or chrome. So now I get to worry about it rusting.