 Is it called slag?
I notice a black outer layer that forms on the objects when I heat them to a high temperature. Is it just steel? or can it be impurities in the steel such as zinc rising to the surface? like slag? It's a black outer scale that has a bit of a waxy look to it. I ask this because I kind of like it, and it doesn't seem to rust the same way as steel? it find it gives the pieces a more natural look.
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