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<p>[QUOTE=&quot;Conder101, post: 1660216, member: 66&quot;]When metal is melted and in the liquid state it can contain dissolved gases.&nbsp; When the liquid is poured into the ingot mold it can contain many tiny bubbles if it was over heated, not maintained in a liquid state long enough for the gas bubbles to escape, or if it was agitated to vigorously while liquid.&nbsp; If the ingot has these bubbles in it so will strip rolled for the ingot and planchets punched from it.&nbsp; If a coin with these tiny bubble inclusions in it is heated enough the metal reaches a &quot;plastic&quot; state.&nbsp; When that happens the bubbles can expand and create these bumps/blisters on the coin.</p><p><br /></p><p>In short a solid piece of metal can have tiny bubbles inside it that will expand and &quot;blow bubbles&quot; if it is heated enough.&nbsp; It does not have to have clad layering.[/QUOTE]</p><p><br /></p>

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