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<p>[QUOTE=&quot;Insider, post: 3053424, member: 24314&quot;]There is an entire thread on CU or here about turning Proof Indians Blue with chemicals.&nbsp; Acetone was one of them.&nbsp; On occasion, when conserving a <b><span style="color: #b35900">brown </span></b>or <b><span style="color: #660000">red-brown</span></b> copper coin I have turned it <b><span style="color: #0000ff">blue</span></b> <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie10" alt=":oops:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie46" alt=":facepalm:" unselectable="on" unselectable="on" /> and then turned it back to <b><span style="color: #b35900">brown</span></b>. </p><p><br /></p><p>The discussion is whether the chemicals change the color or if something on the coin&#039;s surface reacts with the chemicals to change the color.&nbsp; Additionally, is changing the color of a coin with chemicals considered &quot;coin doctoring?&quot;[/QUOTE]</p><p><br /></p>

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