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<p>[QUOTE=&quot;Lehigh96, post: 659642, member: 15309&quot;]The process of heating a metal to reduce the effects of internal stresses is called annealing.&nbsp; I know that the melting point of silver is very low compared to most metals but to accomplish annealing at 140 degrees F sounds a little implausible to me.&nbsp; The problem with using my background in relation to numismatics is that precious metals are not engineering materials and are not really studied at all by the engineering community.&nbsp; We spent all of our time in school dealing with steel, aluminum, copper alloys, nickel and chromium.&nbsp; No mention of silver at all.&nbsp; </p><p><br /></p><p>I will say this.&nbsp; Every metal oxidizes more quickly at higher temperatures.&nbsp; Perhaps the increased heat is enough to cause the metal to oxidize despite the work hardening.&nbsp; I doubt that silver would undergo a change in ductility at that temperature though.</p><p><br /></p><p>With regards to Mr. Johnson and tin.&nbsp; It sounds as though he is very experienced with tin composition medals.&nbsp; I didn&#039;t sound like the guy understood the science behind what he was trying to explain and he was mostly just using his experience.[/QUOTE]</p><p><br /></p>

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