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<p>[QUOTE=&quot;Marshall, post: 3017036, member: 21705&quot;]There are no absolutes. Coins are made of metals that react to the environment to some degree or another. That beautiful coin in cardboard that has developed lovely toning&nbsp; won&#039;t stay that way unless it is preserved with an inert gas housing which keeps the coin surfaces separate from any non inert contamination. Keeping it in the environment which produced the toning just means it will continue toning until or unless it creates it&#039;s own protective environment free from chemical ions in non inert gases.[/QUOTE]</p><p><br /></p>

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