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<p>[QUOTE=&quot;dougsmit, post: 1116658, member: 19463&quot;]There are three schools of thought on the proper definition:</p><p><br /></p><p>Conservative: A patina must form over time and protect the coin from further damage from other forces of corrosion.&nbsp; This patina can not be removed without ruining the coin and is not soluble in water or acetone.</p><p><br /></p><p>Liberal: Anything that has changed on the coin surface since minting is patina.&nbsp; That includes a coin whose &#039;Conservative&#039; patina has been ruined.</p><p><br /></p><p>Commercial: Any way you can increase the sales price of a coin is worth inventing a term to sound good.&nbsp; </p><p><br /></p><p>Tiber Patina: An ancient coin (possibly found in a river) that has a yellow tone matching many coins found in the Tiber River in Rome.&nbsp; (This is toning, not a patina, to a Conservative.)</p><p><br /></p><p>Sand Patina: Caked dirt usually in the low areas makes pretty contrasting surfaces with the high points worn through to the metal or underlying real patina.&nbsp; </p><p><br /></p><p>Are the others?[/QUOTE]</p><p><br /></p>

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