Sorry Doc, I will answer the technical part of the question without care about the philosophical part.
The reason why I answer the question is that I cannot see any reason for people to be suspisios or scared for a gun they intend to buy as this treatment is not possible.
The bluing is not a coating like the chromium or other kinds of platings is.
While a plating is building the surface up the bluing is not building up anything at all.
The bluind is a rust process and if one bluing is removed all bluing will be removed.
Thus it's not possible to remove the russian bluing to have a 100% original rustbluing underneath, as the only thing you would archive is to get a completely grey pistol without any bluing at all.
Regards HÃ?Â¥kan
http://www.vapensmedjan.com