As Ron notes, the effect of this "after rusting" can be brought out when doing an in person investigation by using a small maglight flashlight held at a low angle to the surface. Always take a double A maglight with you to gunshows. You can get educated pretty quickly. Also be aware that although the absence of patina can be strong evidence that a pistol is not old, the presence of patina beneath the blue is NOT proof that the bluing is original. It can be produced.
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