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<p>[QUOTE=&quot;kanga, post: 1150753, member: 9270&quot;]First, learn your teminology.</p><p>You are describing a 2x2, <b>NOT</b> a flip.</p><p><br /></p><p>Second, in general there are two types of &quot;green&quot; problems, and mostly limited to copper coins (but remember, most US coins have a certain percentage of copper in them).</p><p>One type is dry or crusty. That&#039;s most often &quot;verdigris&quot;.</p><p>The other is gooey. That is most often a product of &quot;PVC&quot; exposure.</p><p>Neither is good and can be best prevented by using quality holders.</p><p>The afore mentioned Air-Tites are arguably the best &quot;less expensive&quot; holder.</p><p>2x2&#039;s also work well.</p><p>Only use flips if you KNOW they are PVC-free.[/QUOTE]</p><p><br /></p>

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