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CO powder mixed in a liquid carrier. It goes on well but once rubbed in and dry it seems to come off on hands, etc.... for a while. I have a newe German loom strop with green paste that does the same...

Great!! Black fireplace soot......now I can use something even messier than the chromium oxide pastes! I don't know what it is about that stuff but I get green on everything when I use it. Not so...