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<p>[QUOTE=&quot;GDJMSP, post: 2598630, member: 112&quot;]It doesn&#039;t much matter which theory you choose for in the end the conclusion, or end result if you prefer, is the same - gold tones.</p><p><br /></p><p>That said, with this example posted by the OP, I don&#039;t think that&#039;s toning - I think that is staining. In other words a small particle of foreign material somehow deposited on the coin has caused the discoloration. </p><p><br /></p><p>Similar things are commonly seen on all types of coins. Whenever you see a small circular and very dark center with a fading to lighter color ring around it, it&#039;s almost always due to foreign material having been deposited on the coin. Even tiny droplets of saliva can cause similar effects.[/QUOTE]</p><p><br /></p>

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