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<p>[QUOTE=&quot;Just Carl, post: 212613, member: 4552&quot;]True, true, true to an extent. However, it should be known that the purity of any chemical greatly depends on the results of any reaction. For example PURE Acetone compared to Acetone purchased in the paint department of Walmart would not necessarily be as pure as the chemical purchased as a pure chemical. Then naturally if any chemical is exposed to one substance such as a Silver or Nickel coin and then used with copper some of the previous metal may be in suspension with the already contaminated Acetone creating the rainbow effect. There is no chemical reason I know of why pure Acetone would rainbow Copper by itself for short periods of time. </p><p>&nbsp;&nbsp; As to Lemon juice and salt, again the consistancy of such a solution depends on the purity of the Lemon Juice and the same for the salt. Not only is there an Acid present in a mild form but the salt, if common salt, is actually NaCl and in a solution becomes free ionic elements (Sodium and Chlorine) and can also react with the Copper. </p><p>&nbsp;&nbsp;&nbsp; As to dealers cleaning coins and then having them graded by a grading service, anything is possible. </p><p>Regardless, cleaning a coin is just dumb. Once done it is done and can&#039;t be undone.[/QUOTE]</p><p><br /></p>

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