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<p>[QUOTE=&quot;Leadfoot, post: 521515, member: 2972&quot;]I suspect two things happened here.&nbsp; First, the crust likely formed quickly around the coin after going in the ground, essentially sealing out any corrosive forces from getting to the surface -- that&#039;s why after you removed it no signs of corrosion are left on the coin.&nbsp; Second, you removed all the &quot;evidence&quot; when you overdipped / cleaned the coin and removed this &quot;crud&quot; coating (along with quite a bit of luster).[/QUOTE]</p><p><br /></p>

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