<div dir="ltr"><div>Has anyone been looking into or testing the viability of propylene glycol instead (PG)? Glycerol/glycerin may bind to chitin over time. </div><div><br></div><div>I know some collections add PG to vials of ethanol to avoid dessication. It appears to preserve DNA well and has a low cost, low flammability, etc.</div><div><br></div><div>Chris</div><div><br></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div style="color:rgb(0,0,0);font-family:"Palatino Linotype";font-size:12px;font-style:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:10pt;font-family:Arial;color:rgb(0,120,122);font-weight:700;vertical-align:baseline;white-space:pre-wrap">Christopher C. Grinter</span></div><div style="color:rgb(0,0,0);font-family:"Palatino Linotype";font-size:12px;font-style:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:8.5pt;font-family:Arial;color:rgb(0,120,122);vertical-align:baseline;white-space:pre-wrap">Senior Collection Manager of Entomology</span></div><div style="color:rgb(0,0,0);font-family:"Palatino Linotype";font-size:12px;font-style:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:8.5pt;font-family:Arial;color:rgb(0,120,122);vertical-align:baseline;white-space:pre-wrap">Secretary, The Lepidopterists’ Society</span></div><div style="color:rgb(0,0,0);font-family:"Palatino Linotype";font-size:12px;font-style:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:8.5pt;font-family:Arial;color:rgb(0,120,122);vertical-align:baseline;white-space:pre-wrap">Subject Editor: Lepidoptera, The Pacific Coast Entomological Society</span></div><div style="color:rgb(0,0,0);font-family:"Palatino Linotype";font-size:12px;font-style:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;line-height:1.7999999999999998;margin-top:0pt;margin-bottom:0pt"><span style="font-size:9.5pt;font-family:Arial;color:rgb(138,138,138);vertical-align:baseline;white-space:pre-wrap">California Academy of Sciences</span></div><div style="color:rgb(0,0,0);font-family:"Palatino Linotype";font-size:12px;font-style:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;line-height:1.7999999999999998;margin-top:0pt;margin-bottom:0pt"><span style="font-size:9.5pt;font-family:Arial;color:rgb(138,138,138);vertical-align:baseline;white-space:pre-wrap">55 Music Concourse Dr</span></div><div style="color:rgb(0,0,0);font-family:"Palatino Linotype";font-size:12px;font-style:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;line-height:1.7999999999999998;margin-top:0pt;margin-bottom:0pt"><span style="font-size:9.5pt;font-family:Arial;color:rgb(138,138,138);vertical-align:baseline;white-space:pre-wrap">San Francisco, CA 94118</span></div><div style="color:rgb(0,0,0);font-family:"Palatino Linotype";font-size:12px;font-style:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;line-height:1.7999999999999998;margin-top:0pt;margin-bottom:0pt"><span style="font-size:9.5pt;font-family:Arial;color:rgb(138,138,138);vertical-align:baseline;white-space:pre-wrap">T 415.379.5320</span></div><div style="color:rgb(0,0,0);font-family:"Palatino Linotype";font-size:12px;font-style:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:9.5pt;font-family:Arial;color:rgb(22,101,114);vertical-align:baseline;white-space:pre-wrap">We regenerate the natural world through science, learning, and collaboration.</span></div><span style="font-style:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0px;text-decoration:none;font-size:9.5pt;font-family:Arial;color:rgb(22,101,114);vertical-align:baseline;white-space:pre-wrap">Learn more at</span><a href="http://www.calacademy.org/" style="font-fami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<p class="MsoNormal">Another consideration is the optical clarity of glycerol versus ethanol, both initially and over time. These are display specimens, so it seems a good idea to ensure that whatever medium you use has full-spectrum visibility and is stable
 over time (and under lighting) in that regard. Also, exudates from the specimens (like lipids) might discolor different fluids to differing extents.<u></u><u></u></p>
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<p class="MsoNormal"><b><span style="font-size:10pt;font-family:Tahoma,sans-serif;color:black">Paul Callomon</span></b><span style="font-size:10pt;font-family:Tahoma,sans-serif;color:black"><br>
<i>Collection Manager, Malacology and General Invertebrates</i></span><span><u></u><u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:10pt;font-family:Verdana,sans-serif;color:black">Academy of Natural Sciences of Drexel University, Philadelphia</span></b><span style="font-size:10pt;font-family:Tahoma,sans-serif;color:black"><br>
<i><a href="mailto:callomon@ansp.org" target="_blank">callomon@ansp.org</a> Tel 215-405-5096 - Fax 215-299-1170</i></span><span><u></u><u></u></span></p>
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