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<p>[QUOTE=&quot;huntsman53, post: 514877, member: 1242&quot;]I have had the same result from time to time with coins that were heavy in grime! The gunk acted as a protectant from other factors in the environment and thus prevented natural toning.</p><p><br /></p><p>I have found that after a good soaking in Olive Oil, the use of a green Rose thorn will aid in the removal of some stubborn dirt and even some Verdigris corrosion on primarily Copper composition coins without damaging the surfaces or devices. <span style="color: Red">WARNING: Do not use a Rose thorn on any other composition coin other than primarily Copper composition.</span></p><p><br /></p><p><br /></p><p>Frank[/QUOTE]</p><p><br /></p>

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