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<p>[QUOTE=&quot;Just Carl, post: 286296, member: 4552&quot;]What you have is NOT PVC, NOT Verdigris, Not anything to do with exposure to an Acetate. However, it is possible if your coins were exposed to Vinegar if could be a sort of Acetate Cu ( C2H3O2)2-H2O. The common misconception of PVC contamination is a what is normally called an &quot;Old Wives Tale&quot; This is when people just say something they&#039;ve heard and repeat it over and over and over. However if your coins were exposed to PVC at a temperature of over 200 degrees, that is also possible. Since your coins are Copper or contain Copper and have been exposed to normal air, moisture and Carbon Dioxide, they are just slowly doing what all Copper compounds do. OXIDIZE. This is normal and can be seen where ever Copper is utilized. If you have any Copper piping you will also see it there. Brass and Bronze are Copper compounds and will also eventually turn Greenish. The process is Cu + O = CuO2. Once this browniing occures it is now suseptable to being attacked by moisture ( H OH ) and Carbpm Dioxide ( CO2 ) thus forming Copper Carbonate [ CuCO3-Cu ( OH )2] a greenish substance on Copper. Occationally there is a further reaction if the air in your area is contaminated with Sulfur Oxides ( SO ) or ( SO2 )&nbsp; from Coal Burning organizations. Such substances in the air compbine with moisture to produce what is known as Acid Rain. The final substance on such coins is now Copper Sulfate CuSO4. </p><p>There are numerous methods to remove all such substances such as Olive Oils, WD-40, Acetone and even some say Tamato Juices. Regardless, remember the removal of such green substances will also remove some of the coins metal. Regardless not that most, not all,&nbsp; of the substances refered to contain an ACID. This will further attack your coins. Then&nbsp; a rince in distilled water will be required. </p><p>The safest way to remove&nbsp; this green substance and maintain chemical neutrality is Baking soda/distilled water paste. This will neutralize any further, at least temporary, chemical reactions. ONE MORE TIME. Removal will be considered cleaning and the end results will be a cleaned coin.[/QUOTE]</p><p><br /></p>

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