Jim (Italiansxs) is right. That's why I said; "For a gun that has virtually no case color left, but has some very light discoloration from 'freckling', you might try some Simichrome, Blue Magic, or Flitz polish." The dark spots left from under freckling is about the same thing as the blueing.

Also, while I'm not certain, I suspect a blueing remover may take off case colors. Anyone have any experience with that?