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<p>[QUOTE=&quot;-jeffB, post: 2701141, member: 27832&quot;]Now, now. Taking the silver from 0 to +1 is &quot;oxidizing&quot; it, whether the thing it&#039;s combining with is oxygen, sulfur, chlorine, or something else. Fluorine, the most powerfully oxidizing element, will even oxidize oxygen.</p><p><br /></p><p>I think you&#039;ve hit on the critical point, though:</p><p><br /></p><p><br /></p><p><br /></p><p>Or if you say &quot;toning is what a coin gets from sitting out in the air&quot;, in which case it can include dust, soot, and grease -- all of which can affect color. I tend to agree with your definition (toning = formation of a chemical compound with the top layer of the coin&#039;s metal), but I can imagine others disagreeing.[/QUOTE]</p><p><br /></p>

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