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<p>[QUOTE=&quot;Insider, post: 3056668, member: 24314&quot;]halfcent1793, posed: &quot;<b>The <span style="color: rgb(0, 0, 255)">blue</span> color on the acetone-treated coins is the natural color of the toning</b>. It got that way because you removed the oil on the surface. <span style="color: rgb(0, 102, 0)">You can make it brown again by adding some oil, and you can turn it back by removing the oil. Adding and removing the oil have no effect on the coin itself, just the appearance of it.</span> Unless, of course, you hairline the coin by brushing it.&quot;</p><p><br /></p><p>IMHO, <span style="color: rgb(0, 179, 0)"><span style="color: rgb(0, 179, 0)">most</span> </span>of the above post is <span style="color: rgb(0, 179, 0)">true</span>.&nbsp; Since the color on a coin can be from oxidation or some substance applied to its surface.&nbsp; This substance can either have a color of its own or react chemically to the surface of the coin to change its color. </p><p><br /></p><p>As to the rest <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie96" alt=":vomit:" unselectable="on" unselectable="on" />...please explain:</p><p><br /></p><p>The poster claims the <span style="color: rgb(0, 0, 179)">blue</span> color is natural toning. <span style="color: rgb(0, 0, 0)">Yet, by putting oil back on the coin, the natural toning is removed and it turns </span><span style="color: rgb(179, 89, 0)"><b>BROWN</b><span style="color: rgb(0, 0, 0)">!&nbsp; Then, if we remove the <span style="color: rgb(255, 0, 0)">TRANSPARENT</span> oils on the coins <b><span style="color: rgb(179, 89, 0)">BROWN</span></b> surface, its natural<span style="color: rgb(0, 0, 179)"><b> <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie11" alt=":rolleyes:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie46" alt=":facepalm:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie98" alt=":wacky:" unselectable="on" unselectable="on" /> BLUE </b><span style="color: rgb(0, 0, 0)">color <span style="color: #000000">that was &quot;hiding&quot; under the clear and transparent surface oils returns. </span></span></span></span></span></p><p><span style="color: rgb(179, 89, 0)"><br /></span></p><p><span style="color: rgb(179, 89, 0)"><span style="color: #000000">Please...&nbsp; If copper collectors/dealers like chemically or environmentally altered and very attractive &quot;blue&quot; copper that&#039;s fine. But much of it can be produced on a coin in less than a minute and AFAIK most of the time there is no difference in the color.</span> <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie8" alt=":D" unselectable="on" unselectable="on" />&nbsp; </span>[/QUOTE]</p><p><br /></p>

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