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<p>[QUOTE=&quot;GDJMSP, post: 1339439, member: 112&quot;]The thing about blue on copper is this. It&#039;s not that it&#039;s so unusual, it&#039;s that it&#039;s so easily reproducible. Dip any MS copper into MS70 and they&#039;ll turn blue. Sometimes just in spots like yours, sometimes the entire coin. And it looks perfectly natural in regard to the way a naturally toned coin would look with the color being part of the luster instead of &quot;on&quot; the coin. So blue copper is very often suspect.</p><p><br /></p><p>Problem is there&#039;s no way to say one way or the other, it&#039;s purely a guess as to whether it&#039;s AT or not because copper will turn blue all by itself with natural toning. You just never know, so people treat them with suspicion.[/QUOTE]</p><p><br /></p>

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