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Message:: [QUOTE="Insider, post: 2481061, member: 24314"][USER=78244]@TypeCoin971793[/USER] PM me, there is too much going on with your coin for me to take the time to type.  Then you can share what I tell you over the phone on Monday. Til' then, I should leave it alone while you continue to read all the suggestions that will be made here on CT. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" />  Then, you make the decision. Much of that stuff will come off, but there is some corrosion, dirt, and white debris (I'll bet the white appeared after the acetone soak!).  Ultrasonic in hot MS-70 + some "work" using a stereo scope will make it more presentable.  I'll give you multi-step process to try that I have posted before somewhere on CT. [USER=77413]@RonSanderson[/USER]   Much of the black on your Lincoln cent is dirt and oils, common on old copper.  The green gunk inside the "U" and some of the black should come off with the soak.   TPGS conservation specialists do not have the "time" to soak coins.  It is not "cost effective." <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie46" alt=":facepalm:" unselectable="on" unselectable="on" />  I have learned there are more quicker methods to improve both coins above by "pickin-their-brains."[/QUOTE]