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<p>[QUOTE=&quot;davidh, post: 2800534, member: 15062&quot;]Well, so far I&#039;ve been provided with references to articles on etching copper and on corroding copper, neither of which would apply to the OP&#039;s quarter.&nbsp; Also an article on phosphoric acid which is mildly corrosive to nickel alloys.&nbsp; Add a statement that carbonic, phosphoric, and sulfuric acids attack copper more than nickel alloys.&nbsp; None of this answers what DID cause the damage to the quarter.</p><p><br /></p><p>It&#039;s also been implied that I have made up nonsense and can&#039;t be trusted.&nbsp; That is a valid opinion and I won&#039;t challenge it.&nbsp; Think what you want.&nbsp; I will say that in the case of this thread I did not say what did cause the damage to the quarter, only what did not.</p><p><br /></p><p>I will say that I have a background in which certain ideas are acceptable only when they are backed up with empirical evidence or other unchangeable proof.&nbsp; When I see that someone actually makes a &quot;drier&quot; coin or a duplicate of the OP&#039;s quarter, then, and only then will I accept the method of production.&nbsp; Until then, all hypotheses are just opinions and not worthy of being taken as fact.</p><p><br /></p><p>Here is an example of what a true drier coin might look like.&nbsp; It took 5 years to produce the damage seen and, you might note, the damage is NOT what is typically described as a drier coin, i.e., a hammered and raised rim.&nbsp; Quite the opposite, in fact.&nbsp; <a href="http://imgur.com/gallery/WZoANuU" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://imgur.com/gallery/WZoANuU" rel="nofollow">http://imgur.com/gallery/WZoANuU</a>[/QUOTE]</p><p><br /></p>

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