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<p>[QUOTE=&quot;BadThad, post: 2551051, member: 17261&quot;]Probably not the toning, I was referring more to the natural, organic-type surface layer, some call it a &quot;skin&quot;. The slow adsorption of elements, compounds and the oily, lipophilic materials from humans....it&#039;s interesting science IMO. I&#039;ve theorized the the process many times in my mind. It takes decades for coins to develop a &quot;special&quot; patina (especially gold), one that is barely noticeable and not at all distracting but the trained eye can spot it. I call it a Haze Layer. It&#039;s the composition and thickness of that layer that creates the patina. </p><p><br /></p><p>I know all the experienced guys know what I&#039;m talking about.</p><p><br /></p><p>THF - Me too! But I avoid using it, been over 15 years since I needed it.[/QUOTE]</p><p><br /></p>

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