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<p>[QUOTE=&quot;Victor_Clark, post: 2514930, member: 10613&quot;]You&#039;re welcome. Though it does not actually talk much about coins, it is all about copper and bronze, including the types of corrosion and treatments and conservation. It also includes some relevant quotes from ancient times, mainly from <i>Natural History</i> by Pliny the Elder.</p><p><br /></p><p>&quot;Things made of copper get covered with copper-rust more quickly when they are kept rubbed clean than when they are neglected, unless they are well greased with oil. It is said that the best way of preserving them is to give them a coating of liquid vegetable pitch.&quot;&nbsp; <i>Natural History</i>&nbsp; 34:21[/QUOTE]</p><p><br /></p>

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