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<p>[QUOTE=&quot;Insider, post: 3254055, member: 24314&quot;]NPCoin, posted: &quot;1. humidity and light both help to accelerate oxidation.&quot;</p><p><br /></p><p><br /></p><p>jeffB, posted: 1. is questionable -- humidity catalyzes <i>some</i> oxidation reactions, notably &quot;rusting&quot;, and light can drive <i>some</i> oxidations, but often just by raising the temperature.&quot;</p><p><br /></p><p>So, by your own statement above, #1. is true.&nbsp; Humidity and light (increase in temperature) aid the chemical reaction. </p><p><br /></p><p>jeffB, posted: &quot;But I suspect what <i>really</i> happened with those copper coins Doug and others have seen is that <span style="color: #660066">the acetone, pure and uncontaminated, removed a layer of foreign material that <i>looked</i> like oxidized copper (producing an immediate color change), or removed a layer that was protecting a completely <i>unoxidized</i> copper surface, which quickly turned once it was exposed to air</span> (and humidity and whatever else that air carried). But, of course, I wasn&#039;t there with a fully-equipped lab, so my <i>opinion</i> is only that.&quot;</p><p><br /></p><p>I don&#039;t think that is the case as coins with the exact same surface may or may not change. Want proof?&nbsp; Clean the surface of a copper coin and as soon as one turns blue, you can change it back to brown.&nbsp; Now, apply the acetone again and it turns back to blue.&nbsp; IMO, that removes the case of unoxidized copper and invisible foreign material.[/QUOTE]</p><p><br /></p>

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