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<p>[QUOTE=&quot;desertgem, post: 807162, member: 15199&quot;]I have to ask if the petri plate was new and glass? If it had contained something before, I would repeat the experiment a couple of times to be sure it was from the acetone.</p><p><br /></p><p>Also, having been a microbiologist for years in the past, I know that glass petri plates are rather rare today as most are a resistant plastic and are variable in acetone resistency. When the new science department discarded all glass petri plates to go with plastic ( no dishwasher required, just autoclave), I picked a few up for use with acetone.</p><p><br /></p><p>Plates which had been washed could retain a film, as can glassware from a dishwasher or done by hand. In my glass petri plates, the acetone from Walmart ( gal. can) doesn&#039;t leave any residue. Looking for an ecuse to go back&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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