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<p>[QUOTE=&quot;GDJMSP, post: 153491, member: 112&quot;]What sometimes happens with a dipped coin is that they are not rinsed properly afterwards and some of the dip solution remains on the coin. At first it&#039;s not visible, but given time the solution acts on the metal and cause very dark toning much like what we see here. Humidity tends to accelerate the process and can even make it worse than it was to begin with.[/QUOTE]</p><p><br /></p>

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