Tim.
I did a test with an old and worthless kerisblade at school with sulphuric acid. The chemistry teacher thought it was a nice experiment and was glad to help me with the stuff. She used a concentration lower than the acid in a car battery to control the process better. It worked, the pamor raised but the iron turned more greyish. Maybe if a stronger concentration was used the iron might turned darker, but in my opinion although it was fun to see the result nothing beats the result of the arsenic.
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