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<p>[QUOTE=&quot;Collector1966, post: 1209413, member: 17919&quot;]I tried your method, soaking various copper-alloy coins and one uncirculated US silver coin in two types of malt vinegar-- yellow and black. An uncirculated tuppence, 1p coin and bronze Japanese 10-yen coin were immersed in the yellow vinegar for 8 hours, and the silver coin and another tuppence were immersed in the black vinegar for 8 hours as well. Then all coins were rinsed with tap water, patted dry, and left exposed to the air for 2 days. The black vinegar had no effect at all on my silver coin, and the tuppence was more discolored than toned. </p><p><br /></p><p>The three coins in the yellow vinegar dish showed varying results. The 1p coin was merely discolored, the 2p coin was verrrry slightly toned (but no one in his/her right mind would pay a premium for it), and the Japanese bronze 10-yen coin actually exhibits some rainbow-esque toning (although, once again, not enough for any kind of premium).[/QUOTE]</p><p><br /></p>

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