never happed, do not know why you experienced this, but say using it on a 50% blue, it never harmed the "white" part....I have wrapped a few strands around a brass bore brush, and while not advertised as a bore cleaner, work OK to remove leading.....about every 4 to 5 years, a local customer has a true 99++% commercial luger he has me clean and oil, not that he shoots it, but just keep it in check, Big 45 has never harmed the finish in perhaps 30 years of this.....but to recheck you, I have some "in the white" rifle barrels here, it will test it under magnification and see what happens.....best to you
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