I was rooting around in a shed my father and I had built about 30 yrs ago and found an old double bit axe head and a sledgehammer head along the walls. The sledgehammer is marked SW and 8 pounds made in Japan, the axe head has no makers mark and I am not sure of head style but it looks like the forester, it it 9 inches across and weighs 2 pounds. I put both in a vinegar bath overnight and besides removing rust the ends of the axe turned black while the main body did not, why?












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