Aaron is correct.
Steel with manganese (AISI 10XX Carbon Steel or 15XX Carbon Steels) will typically etch black. The steel component of pattern welded barrels was low carbon - AISI 1005 in the 3 crolle specimens I had composition tested.
Nickel will produce silver, and chromium gray.
Higher carbon also = harder steel which will etch darker.
Last edited by Drew Hause; 06-23-2021 at 01:51 PM..
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