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<p>[QUOTE=&quot;desertgem, post: 740109, member: 15199&quot;]Toning is a group of chemical processes depending on the metal of the coin. If we have a toned coin in our hand:</p><p><br /></p><p>If it stays in the same environment ( on the coin&#039;s surface), it will continue to tone until it turns to corrosion or becomes limited in the reaction.</p><p><br /></p><p>If the coin is isolated or greatly reduced in the exposure to the same environment, the toning will halt at this point.</p><p><br /></p><p>This is why so many questions on the best holders to use or how to limit environmental factors such as humidity and sulfur, oxygen,etc.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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