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<p>[QUOTE=&quot;desertgem, post: 514785, member: 15199&quot;]I don&#039;t know exactly what chemical(s) are involved. I could make an educated guess based on the pH, what it affects, and also the color of the end product, but it is a trade secret, and I shouldn&#039;t speculate.</p><p><br /></p><p>It is intended to remove copper acetate and copper carbonate&nbsp; corrosion, and it reacts with copper oxides only weakly, so if it is not continued too long, the patina of the copper coin ( an incidentally, the so called &quot;carbon spots&quot;) are not removed, or done so weakly.</p><p><br /></p><p>I haven&#039;t asked, but I suspect it is because BU coins have little or no patina to protect the underlying copper, and discoloration could occur.&nbsp; This will be an interesting part of the experiment for me, because even though I have used it on BU cents with no &quot;visible&quot; effects, I have not ran a comparison pair. Now I can know for sure if there is an effect or not. One reason I used a marker to label the BU coins is that after taking end photos I can remove the marks with acetone and see if I can see a difference between the area that was under the mark compared to the area adjacent to it .</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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