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<p>[QUOTE=&quot;mynamespat, post: 4567535, member: 83738&quot;]I&#039;m just gonna go ahead and answer OPs question:</p><p><br /></p><p>I throw out my used acetone after every use.&nbsp; The unwanted substance(s) removed from the coin is still in the acetone.&nbsp; It is just diluted.&nbsp; If you reuse it, the acetone will keep evaporating and the amount of foreign substance will keep increasing.&nbsp; You will be leaving an increasing amount of unwanted substance on every coin going forward.&nbsp; It is often suggested to use multiple acetone baths for this reason.[/QUOTE]</p><p><br /></p>

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