<div dir="ltr"><div class="gmail_default" style="font-size:large">I had that problem in recent years. We use 55 gallon steel drums. A while back, I was convinced the water mixed in the ethanol was oxidizing the metal in the drum and giving it a "rust color". I switched to phenolic lined drums, but eventually, the dilute ethanol
started to discolor with the light brown / orange color of the lining. I have recently purchased LDPE plastic liners for our new 55 gallon drums for dilute solutions of ethanol, but I haven't tried them yet. Are your dilutions in metal containers?</div><div class="gmail_default" style="font-size:large"><br></div><div class="gmail_default" style="font-size:large">Best regards,</div><div class="gmail_default" style="font-size:large">Greg</div><div class="gmail_default" style="font-size:large"><br></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div style="color:rgb(80,0,80);font-family:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)"><div>Greg Schneider<br>Division of Reptiles and Amphibians<br></div><div>Museum of Zoology</div><div>Research Museums Center</div><div>3600 Varsity Drive<br>University of Michigan<br></div><div>Ann Arbor, Michigan 48108</div><div><p style="margin:0px"><a value="+17347630740" style="color:rgb(17,85,204);font-family:verdana,sans-serif;font-size:13.3333px">734 647 1927 </a></p></div></div><div style="color:rgb(80,0,80);font-family:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)"><p style="margin:0px"><span style="font-size:10pt;font-family:Verdana,sans-serif;color:navy"><a href="mailto:ges@umich.edu" style="color:rgb(17,85,204)" target="_blank">ges@umich.edu</a></span><span style="font-family:Tahoma,sans-serif;color:navy"><u></u><u></u></span></p><p style="margin:0px"><span style="color:rgb(31,73,125)"><u></u> <u></u></span></p><p style="margin:0px"><span style="color:rgb(31,73,125)"><img border="0" width="96" height="97" src="cid:image001.jpg@01CD6BEB.4D6147C0" alt="Description: Description: logocolor"><u></u><u></u></span></p><p style="margin:0px"><span style="color:rgb(31,73,125)"><a href="http://www.ummz.lsa.umich.edu/rep_amph/index.html" style="color:rgb(17,85,204)" target="_blank">www.ummz.lsa.umich.edu/rep_amph/index.html</a></span></p></div></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Mar 19, 2020 at 11:58 PM Haff, Tonya (NCMI, Crace) <Tonya.Haff@csiro.au> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div lang="EN-AU">
<div class="gmail-m_-6439348900108316631WordSection1">
<p class="MsoNormal">Hi again,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">On a separate topic, I wonder if any of you have had any experience with unused EtOH developing a yellowish colour? We had this happen to a freshly made batch of 70% EtOH recently, and none of us are clear on what happened or if this is
a problem or not.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thanks,<u></u><u></u></p>
<p class="MsoNormal"><br>
Tonya<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><span>---------------------------------------------------------<u></u><u></u></span></p>
<p class="MsoNormal"><span>Dr Tonya Haff<u></u><u></u></span></p>
<p class="MsoNormal"><span>Collections Manager<u></u><u></u></span></p>
<p class="MsoNormal"><span>Australian National Wildlife Collection<u></u><u></u></span></p>
<p class="MsoNormal"><span>National Research Collections Australia, CSIRO<u></u><u></u></span></p>
<p class="MsoNormal"><span>Canberra, Australia
<u></u><u></u></span></p>
<p class="MsoNormal"><span>Phone: (+61) 02 6242 1566 (office)<u></u><u></u></span></p>
<p class="MsoNormal"><span>(+61) 0419 569 109 (mobile)<u></u><u></u></span></p>
<p class="MsoNormal"><span><u></u> <u></u></span></p>
<p class="MsoNormal"><span>I am in Thursdays and Fridays
<u></u><u></u></span></p>
<p class="MsoNormal"><span>Please call or text my mobile for a fast reponse Monday – Wednesday<u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
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