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<p>[QUOTE=&quot;GDJMSP, post: 322271, member: 112&quot;]While acetone will remove PVC, oils from your fingers if not on the on the coin for very long and sometimes ordinary dirt and grime - it will not remove toning or any metal from the coin. Distilled water will remove only some dirt and grime.</p><p><br /></p><p>Commercial coin dips on the other hand will remove all of the above and they will also remove toning and a very thin layer of metal from the coin. When somebody says they dipped a coin - it is a commercial coin dip they are talking about. All commercial coin dips contain an acid - thiourea. All commercial coin dips, if used improperly, can be harmful to coins. But, if they are used properly, not even the best expert can say with certainty that the coin was dipped. </p><p><br /></p><p>However, because we have the ability to reason, when an old coin appears to be mint fresh and has no trace of toning whatsoever, it is reasonable to assume that this coin has been dipped. That is because all coins begin to tone the instant they are made.[/QUOTE]</p><p><br /></p>

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