<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-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" target="_blank"><span style="font-size:9.5pt;font-family:Arial;color:rgb(22,101,114);vertical-align:baseline;white-space:pre-wrap"> </span><span style="font-size:9.5pt;font-family:Arial;color:rgb(17,85,204);text-decoration:underline;vertical-align:baseline;white-space:pre-wrap">calacademy.org</span></a><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div style="color:rgb(0,0,0);font-family:"Palatino Linotype";font-size:12px;font-style:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;word-wrap:break-word;line-break:after-white-space"><a href="https://www.instagram.com/calacademy/" style="text-decoration:none" target="_blank"><span style="font-size:9.5pt;font-family:Arial;color:rgb(153,153,153);vertical-align:baseline;white-space:pre-wrap"></span></a><span style="font-size:9.5pt;font-family:Arial;color:rgb(22,101,114);vertical-align:baseline;white-space:pre-wrap"></span></div></div></div></div></div></div></div></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jun 24, 2025 at 10:18 AM Callomon,Paul <<a href="mailto:prc44@drexel.edu" target="_blank">prc44@drexel.edu</a>> 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>
<div lang="EN-US">
<div>
<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>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<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>
<div class="MsoNormal" align="center" style="text-align:center"><span>
<hr size="2" width="100%" align="center">
</span></div>
<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>
<p class="MsoNormal"><span><u></u> <u></u></span></p>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
</div>
_______________________________________________<br>
Nhcoll-l mailing list<br>
<a href="mailto:Nhcoll-l@mailman.yale.edu" target="_blank">Nhcoll-l@mailman.yale.edu</a><br>
<a href="https://url.avanan.click/v2/r01/___https://mailman.yale.edu/mailman/listinfo/nhcoll-l___.YXAzOmNhbGFjYWRlbXk6YTpnOmFlNTZhNmVkYTBkNWMwNGMzNDNmYzc0ZDY0YzhhMTJmOjc6OTI1NDo3OGQ1MmIxYTkyZjYzNjM0NmE2ZWE5MGE0MTdhYmUyMDZhM2JhOGFhYzRjYjdlYmY3ZmM4MTJmM2Q5NzVjZjRkOnA6VDpO" rel="noreferrer" target="_blank">https://url.avanan.click/v2/r01/___https://mailman.yale.edu/mailman/listinfo/nhcoll-l___.YXAzOmNhbGFjYWRlbXk6YTpnOmFlNTZhNmVkYTBkNWMwNGMzNDNmYzc0ZDY0YzhhMTJmOjc6OTI1NDo3OGQ1MmIxYTkyZjYzNjM0NmE2ZWE5MGE0MTdhYmUyMDZhM2JhOGFhYzRjYjdlYmY3ZmM4MTJmM2Q5NzVjZjRkOnA6VDpO</a><br>
<br>
_______________________________________________<br>
NHCOLL-L is brought to you by the Society for the Preservation of<br>
Natural History Collections (SPNHC), an international society whose<br>
mission is to improve the preservation, conservation and management of<br>
natural history collections to ensure their continuing value to<br>
society. See <a href="https://url.avanan.click/v2/r01/___http://www.spnhc.org___.YXAzOmNhbGFjYWRlbXk6YTpnOmFlNTZhNmVkYTBkNWMwNGMzNDNmYzc0ZDY0YzhhMTJmOjc6Y2I3NjpkYmNiY2Q5MWQzOGJiYzc4ZTIzNjZhYjdlMDY3ZTA3ZTI0YjgzZDBkZjYzNmU0MzM2N2IyYTNkNTQwNzRiMWM1OnA6VDpO" rel="noreferrer" target="_blank">https://url.avanan.click/v2/r01/___http://www.spnhc.org___.YXAzOmNhbGFjYWRlbXk6YTpnOmFlNTZhNmVkYTBkNWMwNGMzNDNmYzc0ZDY0YzhhMTJmOjc6Y2I3NjpkYmNiY2Q5MWQzOGJiYzc4ZTIzNjZhYjdlMDY3ZTA3ZTI0YjgzZDBkZjYzNmU0MzM2N2IyYTNkNTQwNzRiMWM1OnA6VDpO</a> for membership information.<br>
Advertising on NH-COLL-L is inappropriate.<br>
</div></blockquote></div>