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<p>[QUOTE=&quot;ziggy9, post: 466424, member: 8360&quot;]Davidh</p><p><br /></p><p>If the heat is applied by a torch then the heat right at the tip of the flame will be much hotter than the coin will be just 1/2 inch away thus heating just the center of the coin enough to bubble it.&nbsp; The longer the heat is applied the more the bubble on thecoin will&nbsp; expand</p><p><br /></p><p>high school metal shop!</p><p><br /></p><p>Richard[/QUOTE]</p><p><br /></p>

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