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<p>[QUOTE=&quot;desertgem, post: 700281, member: 15199&quot;]Much of the color appears to be toning.</p><p>Look at the date on the 1910. See the spot between the 9 and the 10. There is a center and a ring like band around it. The band will not come off, but if the center spot should&nbsp; be removed or stabilized, it will prevent the damage from continuing. If removal is not something you would like to do, it can be stabilized as it is.</p><p><br /></p><p>On the 1910 reverse, the dark slash near the U in united, and a spot under N in cents will most likely remain. there also appears on both sides, reverse more than obverse, greenish discoloration which could be some PVC contamination from a previous holder before the cardboard, if not they are most likely the beginning of corrosion.</p><p><br /></p><p>Some of the dark spots on the 20 centavos is deep toning/corrosion, but I would leave alone other than the treatment below.</p><p><br /></p><p>I would use pure acetone - a minute or two soak and holding the coin vertical,a rinse with acetone running over it. Allow to air dry. Do not use water. and put into a safe holder.&nbsp; You can find other safe ways to to use acetone and safe holders discussions.</p><p><br /></p><p>Pure acetone ( according to most users) does not react with metal, and as such will stabilize the coin, Just do not rub or damage the coin as one does so. Contaminated acetone will leave a film, so always use fresh, pure, acetone. I use a lot of it.</p><p><br /></p><p>Acetone isn&#039;t that expensive at Walmart, a couple of ounces would do the job, you like them, so yes, it is worth it. All IMO, mileage may vary.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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