Provides great blueing to metal that has already been thoroughly cleaned and is free of rust. Birchwood Perma Blue Paste Gun Blue is slower to darken than liquid gun blue but will build up a denser finish. The fast-acting liquid gives a non-streaky, uniform blue-black finish to steel (except stainless).
Perma Blue Liquid gun blue will not blue stainless steel, aluminium or non-ferrous metals.
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