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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.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black;mso-ligatures:standardcontextual">Paul Callomon</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black;mso-ligatures:standardcontextual"><br>
<i>Collection Manager, Malacology and General Invertebrates</i></span><span style="mso-ligatures:standardcontextual"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;mso-ligatures:standardcontextual">Academy of Natural Sciences of Drexel University, Philadelphia</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black;mso-ligatures:standardcontextual"><br>
<i><a href="mailto:callomon@ansp.org">callomon@ansp.org</a> Tel 215-405-5096 - Fax 215-299-1170</i></span><span style="mso-ligatures:standardcontextual"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Nhcoll-l <nhcoll-l-bounces@mailman.yale.edu>
<b>On Behalf Of </b>Esther Dondorp<br>
<b>Sent:</b> Tuesday, June 24, 2025 10:23 AM<br>
<b>To:</b> John E Simmons <simmons.johne@gmail.com><br>
<b>Cc:</b> nhcoll-l@mailman.yale.edu<br>
<b>Subject:</b> Re: [Nhcoll-l] Glycerol as a safer alternative to ethanol for display specimens - Feedback from your practice?<o:p></o:p></span></p>
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<p><b><span style="font-family:"Arial",sans-serif;font-variant:small-caps;color:black">External.</span></b><b><span style="font-family:"Arial",sans-serif;font-variant:small-caps"><o:p></o:p></span></b></p>
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<p class="MsoNormal" style="margin-left:.5in">Dear all,<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in">I was following your conversation out of interest and I am curious why you would not want to add a biocide to scientific specimens? Is it damaging? I ask this because we have our largest specimens in a tank in glycerol,
because ethanol was no option (in terms of fire hazard and health and safety). And we added a lot of thymol to keep mold out...Also all the 'cleared and stained' specimens in the collection all have some biocide added to them.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in">Thanks!<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt">Esther Dondorp</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt">Collectiebeheerder reptielen, amfibieën en vissen</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><i><span style="font-size:7.5pt;color:#222222">absent on Wednesdays</span></i><span style="color:#222222"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:7.5pt;color:#222222">Monday, Tuesday, Thursday, Friday</span><span style="color:#222222"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><a href="https://naturalis-public-media-assets.s3.eu-central-1.amazonaws.com/Naturalis-mail-signature/logo.png" title=""Naturalis-logo" t "><span style="font-family:"Arial",sans-serif;text-decoration:none"><img border="0" width="160" height="82" style="width:1.6666in;height:.8541in" id="_x0000_i1032" src="https://naturalis-public-media-assets.s3.eu-central-1.amazonaws.com/Naturalis-mail-signature/logo.png"></span></a><o:p></o:p></p>
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<sub><span style="font-size:8.0pt">- -</span></sub><br>
<sub><span style="font-size:8.0pt"><a href="mailto:esther.dondorp@naturalis.nl" target="_blank">esther.dondorp@naturalis.nl</a> -
<a href="https://www.naturalis.nl/" target="_blank">www.naturalis.nl</a></span></sub><br>
<sub><span style="font-size:8.0pt">Darwinweg 2, 2333 CR Leiden</span></sub><br>
<sub><span style="font-size:8.0pt">Postbus 9517, 2300 RA Leiden</span></sub><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in">Op di 24 jun 2025 om 16:12 schreef John E Simmons <<a href="mailto:simmons.johne@gmail.com" target="_blank">simmons.johne@gmail.com</a>>:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Tahoma",sans-serif;color:black">I agree with Dirk--without a very good seal on the containers, the glycerol will likely absorb moisture from the air, introducing both airborne contaminants
into the containers and possibly causing them to overflow (I have had both happen to containers of specimens in glycerin that were not properly sealed). <o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Tahoma",sans-serif;color:black">Because these specimens do not have scientific value, you should also consider adding a biocide to the glycerol such as a few crystals of thymol or a bit
of camphor (as recommended by Simon Moore).<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Tahoma",sans-serif;color:black">--John<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">John E. Simmons<br>
Writer and Museum Consultant</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">Museologica<br>
<i>and</i><br>
Investigador Asociado, Departamento de Ornitologia<br>
Museo de Historia Natural, Universidad Nacional Mayor de San Marcos, Lima</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in">On Tue, Jun 24, 2025 at 9:40<span style="font-family:"Arial",sans-serif"> </span>AM Marion BILLOT <<a href="mailto:Marion.Billot@geneve.ch" target="_blank">Marion.Billot@geneve.ch</a>> wrote:<o:p></o:p></p>
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<span lang="FR-CH">Dear colleagues,<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span lang="FR-CH"> <o:p></o:p></span></p>
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<span lang="FR-CH">I am currently working on an exhibition project involving fluid-preserved specimens, and I am exploring the possibility of replacing ethanol with glycerol for long-term display purposes. The main objective is to reduce fire hazards and mitigate
health risks in display environments (cases that are not airtight).<o:p></o:p></span></p>
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<span lang="FR-CH"> <o:p></o:p></span></p>
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<span lang="FR-CH">I am preparing to present this proposal internally. As this practice is not yet established in my institution and tends to raise concerns, I would be very grateful for any feedback from professionals who have experience using glycerol in
this context.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span lang="FR-CH"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span lang="FR-CH">To clarify:<o:p></o:p></span></p>
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<![if !supportLists]><span lang="FR-CH" style="font-size:10.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="FR-CH">The specimens are of strictly pedagogical value, they are not scientifically rare or culturally significant.<o:p></o:p></span></p>
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</span></span></span><![endif]><span lang="FR-CH">We aim for long-term display in semi-sealed cases with limited air exchange.<o:p></o:p></span></p>
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<![if !supportLists]><span lang="FR-CH" style="font-size:10.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="FR-CH">I understand that transferring specimens from ethanol to glycerol requires several days of transitional baths in demineralized water to avoid osmotic shock and tissue damage. I am considering a gradual transition:
ethanol 70</span><span lang="FR-CH" style="font-family:"Arial",sans-serif"> </span><span lang="FR-CH">% → 50</span><span lang="FR-CH" style="font-family:"Arial",sans-serif"> </span><span lang="FR-CH">% → 30</span><span lang="FR-CH" style="font-family:"Arial",sans-serif"> </span><span lang="FR-CH">%
→ 10</span><span lang="FR-CH" style="font-family:"Arial",sans-serif"> </span><span lang="FR-CH">%, followed by glycerol in increasing quart-step dilutions. I will let it in a minimum of 4 hours for small specimen (5 cm).<o:p></o:p></span></p>
<p style="margin-left:.5in"><span lang="FR-CH"> <o:p></o:p></span></p>
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<span lang="FR-CH">Have you used glycerol for display purposes in your institution? If so, under what conditions, and with what types of specimens? Any technical advice, protocol suggestions, or reference materials would be most appreciated.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span lang="FR-CH"> <o:p></o:p></span></p>
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<span lang="FR-CH">Thank you very much in advance for your insights. They will be very helpful in supporting a safer and more sustainable exhibition strategy.<o:p></o:p></span></p>
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<span lang="FR-CH">Best regards, <o:p></o:p></span></p>
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<span lang="FR-CH"> <o:p></o:p></span></p>
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<span lang="FR-CH">Marion<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:#4F4F4F">Marion BILLOT</span><br>
<span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:#4F4F4F">Collaboratrice support scientifique<br>
Invertébrés<br>
T. +41 22 418 6459</span><br>
<a href="mailto:marion.billot@geneve.ch" target="_blank"><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:red">marion.billot@geneve.ch</span></a><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:#4F4F4F">Muséum d'histoire naturelle (MHN)</span><br>
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<span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:#4F4F4F">Route de Malagnou 1<br>
1208 Genève</span><br>
<a href="http://www.museum-geneve.ch/" target="_blank"><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:red;text-decoration:none">www.museum-geneve.ch</span></a><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:#4F4F4F">Notre environnement est fragile, merci de n'imprimer ce message qu'en cas de nécessité.</span><o:p></o:p></p>
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<p style="margin-left:.5in"><span lang="FR-CH"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in">_______________________________________________<br>
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_______________________________________________<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="http://www.spnhc.org/" target="_blank">http://www.spnhc.org</a> for membership information.<br>
Advertising on NH-COLL-L is inappropriate.<o:p></o:p></p>
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<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="http://www.spnhc.org/" target="_blank">http://www.spnhc.org</a> for membership information.<br>
Advertising on NH-COLL-L is inappropriate.<o:p></o:p></p>
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