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<p>[QUOTE=&quot;satootoko, post: 35915, member: 669&quot;]To paraphrase a question my mother used to ask, &quot;Doug, do you have to jump off a cliff just because all the other lemmings are doing it&quot;&nbsp; (Poor Marianne. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie3" alt=":(" unselectable="on" unselectable="on" /> )Tarnish is surface damage caused by chemical interaction between the coin and its environment, such as contact with the sulpher content of some paper and cardboard, heat, and a multitude of other factors.&nbsp; When it happens to a zinc coin it&#039;s called corrosion.Some do.&nbsp; They are (not so affectionately) called &quot;Coin Doctors&quot;.Use artificial means to induce harmful chemical interaction between the coin and its environment - rumored to include baking, storing in a closed environment with sulpher matchheads, and other equally evil and destructive tactics. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie4" alt=":mad:" unselectable="on" unselectable="on" />Except when it&#039;s the coin doctor who does the &quot;painting&quot;.&nbsp; (That&#039;s more like making cubic zirconium.&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie8" alt=":D" unselectable="on" unselectable="on" /> )[/QUOTE]</p><p><br /></p>

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