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<p>[QUOTE=&quot;Ordinary Fool, post: 2672976, member: 85318&quot;]I don&#039;t believe new unc coins get subjected to those types of strong chemicals. If they do, just tell me which one specifically causes the &quot;toning&quot; I&#039;ve shown and is very common on the shields.</p><p><br /></p><p>I just about believe with a half an amp arc, I can replicate that toning and plating piercing just by popping one with a tig capable of carrying such a low current arc. A good old transformer unit can do that with very few modern tigs capable of anything less than 3-5A. 3-5A would pop a hole thru a zinker for anything more than an instant. </p><p><br /></p><p>FWIW, I do have both brass and copper pump cans in my old shop that have held up fine for many years. They generally sit near much more reactive exotic metals (than copper) that barely change at all thru the years despite all manners of reactive mayhem taking place in the general area. I store my nitric acids for testing gold content in glass. </p><p><br /></p><p>So it&#039;s unclear to me if, as far as you&#039;re concerned, it doesn&#039;t matter what the cause is since you&#039;re certain the result is toning, or if you reject the specific &quot;toning spots&quot; I&#039;ve shown could be Heat Affected Zones caused most likely in one of two ways.[/QUOTE]</p><p><br /></p>

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