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<p>[QUOTE=&quot;robinjojo, post: 4896147, member: 110226&quot;]Interesting coin.&nbsp; </p><p><br /></p><p>Patina is basically a chemical alteration of a coin&#039;s surface. With bronze the oxidation process alters the copper into an oxide, usually malachite, but also cuprite and in rare instances azurite.&nbsp; This is process gives us the greens, browns, blues and combinations thereof.&nbsp; </p><p><br /></p><p>So, the removal or loss of patina, such as with your coin, does result in the loss of detail in areas because some of the coin is gone.&nbsp; That&#039;s why it is a challenge to clean a coin in a manner that does not irreparably damage it.[/QUOTE]</p><p><br /></p>

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