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<p>[QUOTE=&quot;usmc60, post: 2525537, member: 76739&quot;]You know I kept asking myself that same question, though I have seen on various metals that are one kind of a metal not sandwiched with other metals. Rarely on occasion pieces break away, this is usually caused by a faulty mixture of metal resulting in a flaw in that piece of metal. I have noticed on coin talk quite a few members referred to certain spots or blemishes on coins referred to as stains and or whatnots. Usually when you get a stain on a piece of metal it is generally caused by a founding problem. Which causes a defect in that piece of metal. It could be the size of a pinhead, but as oxygen and time that little pinhead grows into a bigger spot. Certain alloyed metals. Have a tendency to do that.<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie9" alt=":eek:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie9" alt=":eek:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie24" alt=":blackalien:" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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