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<p>[QUOTE=&quot;gronnh20, post: 2487788, member: 73224&quot;]That black mark is no worse than all the stuff forming around the obverse and reverse rims.&nbsp; If you don&#039;t like the black mark put it in a plate full of acetone.&nbsp; A minute or two should do it.&nbsp; If it is still there after that soak, most likely its not coming up.&nbsp; Personally, I would put that coin in my preferential storage as is.</p><p><br /></p><p>One thing on Q-Tips.&nbsp; I would buy the Q-Tips with the long wooden handles.&nbsp; These Q-Tips are used in the electronic industry.&nbsp; They are more tightly wound and less likely to hold on to gritty substances.&nbsp; A trip to the electronics store may surprise you to the tools for use in numismatics.&nbsp; </p><p><br /></p><p>One thing I did not see get mentioned in this thread was mirrored like surfaces.&nbsp; I will attest to the fact I have not tried every known substance to man, but, close.&nbsp; I believe there to be no material known to man on this planet or any other galaxy in this universe that is soft enough that will not put hairlines on mirrored proof like surfaces.&nbsp; The phrase do not touch can not be overemphasized.</p><p><br /></p><p>I go through gallons of acetone.&nbsp; This and other cleaners should have their own thread.&nbsp; Any coins I pull out of circulation that are destined for the accumulation pile go into an acetone bath.&nbsp; One never knows where that coin has been.[/QUOTE]</p><p><br /></p>

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