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<p>[QUOTE=&quot;desertgem, post: 1216119, member: 15199&quot;]The main key is the principle of diffusion. the principle that (gas) molecules are always moving ( faster at higher temperatures), and tend to statistically distribute themselves equally in a container. So imagine then a container with equal amount of sulfide ions ( probably very low unless you are burning high sulfur coal) in the container. Now as the coin reacts and removes a sulfide ions, the quantity in the container ( because they are constantly moving above absolute zero) decrease, but they keep re-distributing themselves randomly. Over a short time, most if not all will be reacted with the raw copper and stay there.Thus none left to react with the other coins.</p><p><br /></p><p>It wont reduce any reactions that have already affected the coin, so it won&#039;t remove tarnish, but it will eliminate more.</p><p><br /></p><p>No sucking involved.[/QUOTE]</p><p><br /></p>

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