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<p>[QUOTE=&quot;GDJMSP, post: 166288, member: 112&quot;]Most people never notice it, but an MS coin will tone faster and easier than a circulated coin. And if you think about it for a minute, there&#039;s a reason for that. </p><p><br /></p><p>Mint state coins have typically have lots of luster, but what causes luster ? Luster is created by the flow lines of the metal when the coin is struck. And if you think about those flow lines and what they would look like if greatly magnified it would be kind of like this - /\/\/\/\/\/\/\ - the flow lines are like fine grooves with the sides exposed. This means that more surface area is exposed to the elements than if the surface were like this - ______________ . And that additional surface area is not flat and smooth, it is kind of rough in a microscopic way. And that roughness allows the air to react with the metal because the particles of the metal are so fine - it cause them to oxidize more easily. Thus MS coins tone quicker and more easily than circulated coins which typically have little luster and a flat, smooth surface.</p><p><br /></p><p>Now as to why your coins are toning, I would say it is a combination of all things - the cardboard holders, the humidity in the air, where you live because the air is different in different parts of the country, and also how you heat and cool your home. In other words, the environment.</p><p><br /></p><p>Place your MS coins in good quality holders, keep them in a cool dry place with a consistent temperature and they will either not tone or they will much, much more slowly.[/QUOTE]</p><p><br /></p>

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