We got this new stuff at work by birchwood Casey. Its a metal blackening paste. I've used it on a couple of old knives, stuff works great, it is more a blending than a coating. I took an old blued Ka-Bar and touched it up, looks really good. Came out Blue, not black. Then I put it on a piece of hardened O-1 steel then put super blue over it, it looks like case hardening. I wouldn't do it on any collector grade items, but, for user stuff its great-SDH
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