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<p>[QUOTE=&quot;SuperDave, post: 2900925, member: 1892&quot;]There&#039;s a whole lot of truth concentrated in this post. </p><p><br /></p><p>For the record, shellac or some similar coating will keep copper from coloring, but that&#039;s not the point because it isn&#039;t in evidence on the exceptions we&#039;re discussing. Every once in a great while, perhaps, the Mint planchet pre-treatment somehow &quot;sticking&quot; more strongly - or an accident of surface composition - or a lucky continuous happenstance of location and storage technique - could result in a copper retaining its&#039; original color. But not as often as the quantity of older Reds in the market indicates. <b>Thiourea</b> does not do well with copper, but <b>something</b> has to. </p><p><br /></p><p>We&#039;re surrounded by proof which is apparent with the application of logical reasoning.[/QUOTE]</p><p><br /></p>

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