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<p>[QUOTE=&quot;GDJMSP, post: 2916900, member: 112&quot;]It&#039;s not true, at least not in the way it was stated. Copper and silver, and nickel too for that matter, can be pitted by improper dipping. And by improper ultrasonic cleaning. But granted copper is more susceptible to both.</p><p><br /></p><p>That said, there are those who agree with the claim. But this is largely because copper is a much more reactive metal than other coinage metals and because it is more reactive it tends to develop minor pitting more readily simply as a result of the corrosion, the toning, that is taking place. And then when copper is dipped that pitting becomes more readily visible. But the pitting was already there before the dipping ever occurred.[/QUOTE]</p><p><br /></p>

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