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<p>[QUOTE=&quot;GDJMSP, post: 1835339, member: 112&quot;]As said already, it depends on how the coins are stored. Under certain conditions a silver coin could turn black in just a few months. Or, it may take a century or longer.</p><p><br /></p><p><br /></p><p><br /></p><p>There&#039;s several reasons for that, first among them the number of coins involved between the two. For 18th century you&#039;ve got 9 years worth of coins, for 19th you&#039;ve got 100 years worth. So the one outnumbers the other by a factor of 10 to 1 to start with. Then you have to consider how many coins from the 18th were saved, vs how many from the 19th were saved, that likely factors in the hundreds to 1. Then you have to consider that plain, ordinary grey toning outnumbers colorful toning by factors of tens of thousands to 1. </p><p><br /></p><p><br /></p><p><br /></p><p>Not really. There have been literally millions and millions of collectible coins ruined by unchecked toning because collectors were not aware of or did not use proper storage. There are millions more being ruined right now by the same thing.</p><p><br /></p><p>Just a guess on my part, but I&#039;d wager that only 10% or so of collectors utilize proper storage.[/QUOTE]</p><p><br /></p>

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