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<p>[QUOTE=&quot;Paul M., post: 2089759, member: 73165&quot;][USER=73555]@doug5353[/USER] is completely correct here.&nbsp; There&#039;s a big difference between rust of the type that forms on iron or steel and toning we see on silver coins.&nbsp; Rust is flaky and does not adhere to the underlying metal, whereas the silver sulfide/oxide toning we see on coins does adhere to the coin.&nbsp; While a silver coin <i>can</i> be turned completely black due to the thickness of the sulfide/oxide layer not letting light through to the underlying metal, it&#039;s not coming off through any mechanical process short of literally filing or abrading it away.</p><p><br /></p><p>In this qualitative sense (although not chemically), rust on iron is more similar to bronze disease on ancient coins than it is toning on silver coins, and &quot;lead rot&quot; that one will hear miniature figure collectors refer to at times.[/QUOTE]</p><p><br /></p>

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