Not sure what "parts" you had get dicolored.....I have only seen aprox several hundred Russian Capture rifles in person and x ? who knows how many in on line pics. paint stripper like acetone in the the short term will not remove blue. My only question would be....What parts did you put paint stripper on ? ....And why ? It is made to remove shellac, varnish , paint and some types of stain FROM WOOD! are there any other questions ? Why were you applying it to metal ?My use of "paint stripper" products left discolored parts due to the chemical content of the stripper.