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<p>[QUOTE=&quot;calcol, post: 2809889, member: 77639&quot;]Reagent grade acetone, as defined by ACS (see link) requires minimum 99.5% purity as far as acetone content goes.&nbsp; However, the nature of the 0.5% impurity has specified limits.&nbsp; There are purer grades of acetone, such as those labeled suitable for HPLC, but the price goes up steeply.&nbsp; Acetone sold in hardware stores is pretty good stuff; you can usually access the Safety Data Sheets online.&nbsp; In the US, the ones I&#039;ve seen list 100% for the acetone content; so with rounding in mind, that means 99.5% or better.&nbsp; Main difference between hardware store acetone and reagent grade is that the latter had been put through a battery of tests dealing with the impurities.</p><p><br /></p><p>Remember the stuff burns really well and the vapors can be explosive.</p><p><br /></p><p>Coins that have a layer of oil or varnish may appear different once it is removed by acetone.&nbsp; Copper may react with acetone in the presence of heat or UV light, or these factors may cause copper to catalyze reactions between acetone and oxygen leading to nasty products.&nbsp; Acetone dissolves some plastics.</p><p><br /></p><p>Cal</p><p><br /></p><p><br /></p><p>ACS specs: <a href="http://pubs.acs.org/doi/pdf/10.1021/acsreagents.4005" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://pubs.acs.org/doi/pdf/10.1021/acsreagents.4005" rel="nofollow">http://pubs.acs.org/doi/pdf/10.1021/acsreagents.4005</a>[/QUOTE]</p><p><br /></p>

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