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Re-Bluing with Birchwood Casey Super Blue vs Brownells Oxpho-Blue. Performance and results comparison. In this video we’ll test the darkening and durability potential of two of the more popular cold bluing product. The test will be conducted on a badly corroded FEG P9RZ pistol as well as on a separate piece if scrap metal. We’ll also explore the benefits of additional applications. This is a restoration follow-up video to my previous video, FEG P9RZ 9MM Tabletop Review - Episode #202410.