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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hi Rebecca,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Always good to try some informal experiments. Indeed, it is not surprising that filtering UV would not reduce fading rate. It is interesting to compare how chlorophyll “sees” light with how people
see light (see, for example, <a href="https://www.demegrow.com/blogs/research/70623171-what-plants-see-separating-lumens-from-effective-par-epar">
https://www.demegrow.com/blogs/research/70623171-what-plants-see-separating-lumens-from-effective-par-epar</a>)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">In a broad Getty Conservation Institute study (attached) removing oxygen during exposure led to a 10 to 20 times reduction in discoloration of herbarium specimens provided by the Canadian Museum
of Nature. That seems like a pretty good reduction but, when you think about it, that just changes the lifetime on exhibit from a few months to a few years. Strategies to limit light levels and exposure times would help and I can imagine some other strategies
to reduce loss in value (perhaps protecting a part of the specimen from light would reduce the loss of value by keeping that part unaltered). I think that would be interesting to discuss with curators, researchers, and other collection users but I think we
do best to consider display of herbarium specimens a consumptive use of the color of those specimens.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Rob</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:black">Robert Waller, PhD, CAPC, FIIC<br>
President and Senior Risk Analyst<br>
Protect Heritage Corp.<br>
622 Simoneau Way<br>
Ottawa ON K4A 1P4<br>
email: </span><span style="color:#0563C1"><a href="mailto:rw@protectheritage.com"><span style="color:#0563C1">rw@protectheritage.com</span></a></span><span lang="EN-US" style="color:black"><br>
</span><span style="color:black">internet: </span><span lang="EN-US" style="color:black"><a href="http://www.protectheritage.com/"><span lang="EN-CA" style="color:#0563C1">www.protectheritage.com</span></a><br>
</span><span style="color:black">phone: 613-883-2707 (Canada)<br>
phone: 303-872-9739 (USA)<br>
</span><span lang="EN-US" style="color:black"><img border="0" width="16" height="16" style="width:.1666in;height:.1666in" id="Picture_x0020_1" src="cid:image001.gif@01D8321A.B4062630"></span><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#494A4C;background:white"><a href="http://orcid.org/0000-0002-9500-4113"><span style="color:#0563C1">http://orcid.org/0000-0002-9500-4113</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">skype: rrwaller</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="color:black">and, </span></i><span style="color:black">Research Associate, Canadian Museum of Nature<br>
<i>and,</i> Adjunct Assistant Professor, Queen’s University<br>
<img border="0" width="85" height="30" style="width:.8854in;height:.3125in" id="Picture_x0020_5" src="cid:image002.jpg@01D8321A.B4062630" alt="iic_fellowship_logo_2019">
</span><span lang="EN-US" style="color:black"><img border="0" width="35" height="35" style="width:.3645in;height:.3645in" id="Picture_x0020_9" src="cid:image003.png@01D8321A.B4062630">
<img border="0" width="95" height="34" style="width:.9895in;height:.3541in" id="_x0000_i1030" src="cid:image004.png@01D8321A.B4062630"><br>
</span><span style="color:black"> </span><a href="http://www.protectheritage.com/"><span style="color:black;text-decoration:none"><img border="0" width="95" height="30" style="width:.9895in;height:.3125in" id="Picture_x0020_2" src="cid:image005.png@01D8321A.B4062630" alt="ProtectHeritage_logo"></span></a><span style="color:black">
<img border="0" width="60" height="45" style="width:.625in;height:.4687in" id="Picture_x0020_3" src="cid:image006.png@01D8321A.B4062630" alt="QueensLogo_colour">
</span><a href="http://www.nature.ca/"><span style="color:#0563C1;text-decoration:none"><img border="0" width="95" height="24" style="width:.9895in;height:.25in" id="Picture_x0020_4" src="cid:image007.png@01D8321A.B4062630" alt="cmn_logo"></span></a><span style="color:black">
<br>
<br>
</span><a href="http://www.facebook.com/ProtectHeritageCorp?ref=tn_tnmn"><span lang="EN-US" style="color:#0563C1;text-decoration:none"><img border="0" width="102" height="28" style="width:1.0625in;height:.2916in" id="Picture_x0020_6" src="cid:image008.png@01D8321A.B4062630" alt="image007"></span></a><span style="color:black">
</span><a href="https://twitter.com/#!/ProtectHeritage"><span style="color:black;text-decoration:none"><img border="0" width="76" height="28" style="width:.7916in;height:.2916in" id="Picture_x0020_7" src="cid:image009.png@01D8321A.B4062630" alt="image009"></span></a><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Nhcoll-l <nhcoll-l-bounces@mailman.yale.edu>
<b>On Behalf Of </b>Hawkins, Rebecca Keanni<br>
<b>Sent:</b> March 5, 2022 5:11 PM<br>
<b>To:</b> nhcoll-l@mailman.yale.edu<br>
<b>Subject:</b> [Nhcoll-l] How to display herbarium specimens without color fading<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Hello everyone,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Is there a way to display herbarium specimens without color fading? As I understand it, exposing an herbarium specimen to sunlight (and maybe even artificial light?) will cause the specimen's colors
to fade to various shades of brown. This question isn't for any specific project or exhibition, just something I've been curious about ever since I helped an herbarium make a small university display and its specimens turned brown after a few months of summer
sun.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">I did try an informal experiment where I put an herbarium specimen in a glass picture frame with UV blocking window film. However, the specimen's color faded just as fast as a control specimen
without the film. This suggests that there was fault with the film itself or my application of it, or even that UV light alone is not what is causing the color of herbarium specimens to fade.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Any ideas? Thanks!<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Rebecca Hawkins (she/her)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">M.A. Student in Museum Studies<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">University of Kansas<o:p></o:p></span></p>
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