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<p>[QUOTE=&quot;crypto79, post: 2645181, member: 24254&quot;]Skin is dirt, grim and oils left after many years, tone is chemically reactive metals. If you have an old coin and dip it in acetone you will clean all the dirt and oil away but the colored metal will remain. Tone and skin are two different things but they influence each other. Dirt can slow or speed up the toning process[/QUOTE]</p><p><br /></p>

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