Limitations
Bluing only works on steel or stainless steel parts for protecting against corrosion. Because it changes the Fe into Fe3O4, it does not work on non-ferrous material. Aluminum and polymer parts are largely unaffected by bluing; no protection against corrosion is provided by bluing processes on them, although uneven staining of the aluminum and polymer parts can be caused by attempts at bluing.
Holster wear will remove hot bluing, rust or fume bluing over long periods of use; it will remove cold bluing over relatively short periods of use, from any wear areas that are "touched up" with cold bluing solutions.
Read more about this topic: Bluing (steel)
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