Good question. The cylinder is titanium and you're looking at the raw metal. The frame and outer barrel appear to have gone through some anodizing process. I've heard that some solvents can stain it.
I've carried/cleaned mine just like anything else and had zero problems with it's finish.
I believe that the earlier PD versions were mostly done in a black paint-type finish, rather than the anodized finish on the later example Joe's pictures shows.
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