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<div class="moz-cite-prefix">Hi Rob and all,</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">interesting point about the presence of
oxygen; doesn't this point to oxidative degradation of carotenoids
and chlorins and oxygen as an mediator for fading ?</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">With best wishes</div>
<div class="moz-cite-prefix">Dirk<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Am 07.03.2022 um 17:58 schrieb Robert
Waller:<br>
</div>
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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"
moz-do-not-send="true" class="moz-txt-link-freetext">
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"
moz-do-not-send="true"><span style="color:#0563C1">rw@protectheritage.com</span></a></span><span
style="color:black" lang="EN-US"><br>
</span><span style="color:black">internet: </span><span
style="color:black" lang="EN-US"><a
href="http://www.protectheritage.com/"
moz-do-not-send="true"><span style="color:#0563C1"
lang="EN-CA">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 style="color:black" lang="EN-US"><img
style="width:.1666in;height:.1666in" id="Picture_x0020_1"
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lang="EN-US"><a href="http://orcid.org/0000-0002-9500-4113"
moz-do-not-send="true"><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 style="width:.8854in;height:.3125in"
id="Picture_x0020_5"
src="cid:part2.50O25Qii.h25uqaMu@snsb.de"
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height="30" border="0">
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<br>
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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>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span
lang="EN-US"> Nhcoll-l
<a class="moz-txt-link-rfc2396E" href="mailto:nhcoll-l-bounces@mailman.yale.edu"><nhcoll-l-bounces@mailman.yale.edu></a>
<b>On Behalf Of </b>Hawkins, Rebecca Keanni<br>
<b>Sent:</b> March 5, 2022 5:11 PM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:nhcoll-l@mailman.yale.edu">nhcoll-l@mailman.yale.edu</a><br>
<b>Subject:</b> [Nhcoll-l] How to display herbarium
specimens without color fading<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:black">Hello everyone,<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
</div>
<div>
<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>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
</div>
<div>
<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>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:black">Any ideas? Thanks!<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
</div>
<div>
<div id="Signature">
<div>
<div>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:black">Rebecca Hawkins
(she/her)<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:black">M.A. Student in
Museum Studies<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:black">University of
Kansas<o:p></o:p></span></p>
</div>
</div>
</div>
</div>
</div>
<br>
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