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<p>[QUOTE=&quot;GDJMSP, post: 1628954, member: 112&quot;]Toning progresses in stages, the darker it is the more advanced the stage. Once it has turned black it has reached the point that it is corroding the coin, eating into the surface of the coin. And if that black toning is removed the damage from the corrosion is visible on the coin.</p><p><br /></p><p>However, in the earlier stages of toning, if the toning were removed, there is no visible damage to the surface of the coin. That is the difference.[/QUOTE]</p><p><br /></p>

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