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<p>[QUOTE=&quot;Marshall, post: 7524942, member: 21705&quot;]Toning, at it&#039;s root, is a chemical change to the surfaces of the coin. Sometimes it&#039;s pretty and sometimes it&#039;s not. Whether it is in an environment that promotes or inhibits additional exposure to the elements causing the chemical changes will determine whether it will continue to tone or not.</p><p><br /></p><p>Whether it develops a protective patina or an ugly corrosion is also dependent on the environment it is exposed to.</p><p><br /></p><p>Add to that, different specialties treat toning, patina and corrosion differently.[/QUOTE]</p><p><br /></p>

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