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<p>[QUOTE=&quot;Just Carl, post: 302122, member: 4552&quot;]Usualy misunderstanding. More than likely not Verdigris, PVC or corrosion. Appears to be Copper Carbonate from exposure to Oxygen, Carbon Dioxide and moisture. Almost everywhere you&#039;ll see Copper, Brass and Bronze turning green from that exposure. Anything more than soaking in Acetone would be removing part of the coin&#039;s metal leaving pot marks. If in a state of disperatioin try a very mild solution of Baking soda and distilled water and very, very lightly rub with that. This will neutralize additional reactions for a while at least. Then make sure you put in a 2x2 or something like that. </p><p>For guns! After you use them clean well with almost anything. I use Carburator Cleaner and a soft wire brush. Also, WD-40. When the black color stops, I spray the inside with spray grease. Naturally you really must clean out this stuff prior to another round of shooting. You can purchase a decent Carburator Cleaner in a can at Walmart. Not sure but I think it&#039;s called Teck or Tech or something like that and in a black colored can. Also, in the same auto section you can find the spray grease by the same manufacturer. The spray grease is in a can and you can attach the little red plastic tube to the head and use in small areas. This stuff is great for long term storage of guns also. I use it on my Mauser Broomhandles since I never shoot them. Same with my Lugers. I use the same thing on door hindges, fence gates, door locks and many other places. It will stay so don&#039;t put it in places where you will&nbsp; be touching with nice clothing on.[/QUOTE]</p><p><br /></p>

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