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<p>[QUOTE=&quot;gsimonel, post: 2784792, member: 82549&quot;]Silver is fine. Copper isn&#039;t, and will get eaten up by lemon juice. Up until the time of Nero, the silver in the coins was pure enough that you can probably clean them with lemon juice without causing any damage. But Nero started debasing the silver in his coins, and the silver content was reduced several times after that. By the time you get to Septimius Severus, the silver content of a denarius was just above 80%, and down to around 55% by the end of his reign. So you need to be very careful using anything acidic on Severan-era denarii. </p><p><br /></p><p>Besides ammonia, which I haven&#039;t tried before but plan to test, has anyone ever using the method of placing aluminum foil on the bottom of a glass container, adding a silver coin, placing more foil above the coin and then filling the container with a hot solution of water and sodium carbonate?[/QUOTE]</p><p><br /></p>

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