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Posted 05/28/2011 12:12 pm
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I believe it works because the date is compressed differently than the surrounding area, so the acid etches the metal at different rates.
yep. As I recall, the raised areas end up with a higher copper content, so when the vinegar/nic-a-date/muriatic acid eats away the nickel, the raised areas become pronounced again.I believe it works because the date is compressed differently than the surrounding area, so the acid etches the metal at different rates.
