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<p>[QUOTE=&quot;Insider, post: 2346830, member: 24314&quot;]Actually, when this experiment was done decades ago, for a very long time we could still EASILY tell the coin was struck as a proof - until we finally got uninterested <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie104" alt=":yawn:" unselectable="on" unselectable="on" />&nbsp; I&#039;ve looked for my notes on that project in order to pin down some time periods/changes with no luck so far.&nbsp; I do not wish to say any more now <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie66" alt=":muted:" unselectable="on" unselectable="on" />, so I don&#039;t spread misinformation. </p><p><br /></p><p>However, I&#039;m happy to inform you that after a conversation w/conservation people a few weeks ago when I referenced my original test; I started another one.&nbsp; At this time, I have had a proof CLAD dime soaking for several weeks.&nbsp; The first change was the surface darkened and the copper edge is being attacked.&nbsp; I&#039;ll post some photos when I notice more changes.&nbsp; BTW, my original test was done with a Silver Kennedy Proof.[/QUOTE]</p><p><br /></p>

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