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<p>[QUOTE=&quot;-jeffB, post: 1709367, member: 27832&quot;]Sure, you can make 100% isopropanol or ethanol -- just not by simple distillation. And if you leave either one sitting open, it&#039;ll absorb water from the air (even as it evaporates), until either it&#039;s all evaporated or it reaches <a href="http://en.wikipedia.org/wiki/Azeotrope" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://en.wikipedia.org/wiki/Azeotrope" rel="nofollow">azeotropic composition</a>.</p><p><br /></p><p>If you put 90% (actually 91%) isopropanol on a surface and let it evaporate, the alcohol and the water will evaporate together, and the stuff left will remain at that 91% concentration until it&#039;s all gone. All that will be left is whatever else was mixed into the alcohol from the beginning (Doug&#039;s colors and fragrances, if any), and whatever the alcohol dissolved off the surface.</p><p><br /></p><p>The hospital where I used to work had big tanks of 100% ethanol, carefully guarded against (a) fire and (b) pilfering. Mix it with water and you produce perfectly normal hooch, although that&#039;s an awfully expensive way to go about it.[/QUOTE]</p><p><br /></p>

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