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<p>[QUOTE=&quot;walterallen, post: 168791, member: 4068&quot;]The change in the color of copper depends on the environment or atmosphere that it has been exposed to. Sealing it from an environment that will make it change from red to brown will preserve it&#039;s present state. Copper does not need to be touched physically to start turning from red to brown, so mint state browns are quite common, yet they do not command the premium of a red. </p><p><br /></p><p>The turning/toning of any coin/metal is dependent upon the type of environment it is exposed to. Heat and sunlight can also affect a coin/metal.[/QUOTE]</p><p><br /></p>

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