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<p>[QUOTE=&quot;Just Carl, post: 215064, member: 4552&quot;]Extreamly misunderstood. Note that Verdigris is in reality Cu(CH3COO)2-H OH.&nbsp; Normally not found on Copper coins though. What is so commonly thought to be Verdigris is just a normal Oxydation process that Copper goes through. It starts by exposing bare Copper to Oxygen forming Cu2O. Moisture (H OH) normally shown as H2O along with Carbon Dioxide in the air then attacks the Cu2O to form Copper Carbonate [CuCO3-Cu(OH)2] and this is the greenish patina on copper that is so commonly thought to be Verdigris. To continue this reaction if your in an area such as upper Indiana where there is a large amount of Sulfites and/or Sulfates in the air, this now attacks the Copper Carbonate to form darker Greenish crytaline formations (CuSO3 or CuSO4) on Copper coins. Many people note this to happen to Copper based piping in thier homes also. Normally a swab of Vinegar on a peice of cloth will remove this from your pipes but is not nice for coins due to the 4% Acetic Acid in the Vinegar. Sorry for the chem stuff. Also, sorry about not being able to utilize the lower case numbering for the formulae. </p><p>&nbsp;&nbsp;&nbsp; Now after&nbsp; several days of the Copper Cents in the Acetone I just removed them, placed them on my patio table to dry. No rinse at all. Can&#039;t even remember how many days they were in there. Here is the results. </p><p>A 1944S in AU50 shows no change at all. Still looks like it did several days ago.</p><p>A 1972D in VG8 or better had a greenish crud when started and it is still there. </p><p>A 1974S and 1974D both MS60 or better except had some black spots when first put into the Acetone and they are still there otherwise also, no change.&nbsp; </p><p>My summation is if truely high grade, pure Acetone is used not much happens to a Copper coin. However, anything is possible if left in there for a few hundred years. Don&#039;t think I&#039;ll try that though.[/QUOTE]</p><p><br /></p>

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