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<p>[QUOTE=&quot;Publius2, post: 4571883, member: 105571&quot;]To the OP&#039;s original question:&nbsp; For any coin with real value to you, whether financial or otherwise, you should always use fresh acetone.&nbsp; Once acetone has dissolved the contaminants, they are now present in the solvent; some as disassociated chemical compounds and some as particulates.&nbsp; When this contaminated solvent is re-used and the acetone evaporates from the cleaned surface, it leaves behind the particulates and some of the compounds. </p><p><br /></p><p>This recommendation is not theoretical:&nbsp; I make high-precision machine tool parts and also do some amateur gunsmithing and use acetone regularly to clean parts prior to lay-out marking, bluing and painting.&nbsp; Used acetone always leaves a film.&nbsp; You may not see it on a coin but it&#039;s there.&nbsp; You can test this yourself.&nbsp; Take a shiny SS table knife and wash it with fresh acetone and then let it air dry.&nbsp; Observe the surface which will usually show a faint hint of film because even fresh commercial acetone is not 100% pure.&nbsp; Then wash the knife with used acetone. You will readily see the film left on the knife blade from the greater degree of contamination in the used acetone.</p><p><br /></p><p>As for the re-use and disposal of used acetone:&nbsp; I reuse contaminated acetone for non-critical cleaning until its solvent properties are no longer effective.&nbsp; Normally, it evaporates before that point is reached.&nbsp; There are no real rules for when you should stop using it.&nbsp; For disposal, I just throw it on the shop&#039;s concrete driveway and let it evaporate, making sure it doesn&#039;t get into the soil.&nbsp; Any means of safe evaporation is the correct means of disposal.&nbsp; Acetone fumes are highly flammable so take due care.[/QUOTE]</p><p><br /></p>

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