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<p>[QUOTE=&quot;Just Carl, post: 501463, member: 4552&quot;]In reality your sort of correct. It&#039;s just that people that don&#039;t know, use expressions they&#039;ve heard somewhere such as PVC damage and/or Verdigris. Verdigris is (CH3COO)2 and is normally called an acetate. The reason is it is created by the attack of something like Acetic Acid on Copper. </p><p>And true Silver Nitrates and Oxides are called Tarnish and since this metal reacts so readily with other substances, the discolorations can vary. A Silver persulfate Ag2(SO5)3, for example could be confused with Verdigris. </p><p>This is true of Gold. For example although Au2S is actually a Br/Bk discoloration, AuCl3 too is a discoloration, some may well just say things like </p><p>VERDIGRIS. Others say it&#039;s PVC. </p><p>Of course it&#039;s true that most coins do contain Copper but usually an insufficient amount and not in a great location molecular wise to become attaced by an Acetate. </p><p>Then too the government may be telling us our coins that are supposed to be Silver or Gold are in reality Copper and painted to look like that.:goofer:<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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