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<p>[QUOTE=&quot;Oldhoopster, post: 7752281, member: 84179&quot;]I can also confirm that a quarter will completely melt at 2850 degrees F.</p><p><br /></p><p>It wasn&#039;t my dumb mistake, but when I worked for a company that made wear resistant aluminum oxide ceramics, one of my operators called me to evaluate some stained and cracked parts that just came out of the kiln.&nbsp; The part that had the heaviest damage had a visible void.&nbsp; When I broke it apart, there was a partial imprint of the obverse of a Washington quarter as well as some reeding.</p><p><br /></p><p>The parts are made by hydraulically pressing the powder, then firing in a kiln.&nbsp; Somehow a quarter got into the powder hopper and was pressed inside the part.&nbsp; When it was fired to 2850F, the quarter completely melted and the metal flowed into the surrounding parts and kiln shelf causing cracking and large black stained area (probably forming a copper aluminate and other stuff).</p><p><br /></p><p>Never did find out if it was an accident or intentional, but we made a big deal about the investigation to make sure nobody decided it would be fun to try again .[/QUOTE]</p><p><br /></p>

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