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<div class="moz-cite-prefix">seconding Paul ... could also be cold
outer walls, e.g., in subsurface buildings ...</div>
<div class="moz-cite-prefix"><br>
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<div class="moz-cite-prefix">And rust (metal corrosion) could also
affect dry collections (e.g. rusting/corrosion of historic insect
pins)</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">All the best</div>
<div class="moz-cite-prefix">Dirk<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
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<div class="moz-cite-prefix">Am 25.06.2021 um 16:32 schrieb
Callomon,Paul:<br>
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<blockquote type="cite"
cite="mid:SN6PR01MB5231FF537EF8ECD0B74215DCC3069@SN6PR01MB5231.prod.exchangelabs.com">
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<p class="MsoNormal">In our experience a recurring
problem in wet collection environments is the
combination of ambient high humidity and
lower-than-ambient temperature. The dew point – the
temperature at which water vapor condenses – is a
function of both factors; with ambient humidity but
below-ambient temperatures, such as in a room that has
air cooling but no humidity control, condensation
happens when it would not if the temperature was also
ambient.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Water will condense onto the
coldest surface first, which tends to be the glass
bottle surface. Room dehumidifiers exploit this effect
by cooling a coil with refrigerant gas to present an
even colder surface on which condensation will thus
happen first. Purpose-built fluid storage rooms often
have an air drier that removes vapor from the incoming
air before it is cooled, thus providing both humidity
and temperature control.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Many years ago we constructed an
entire building thus equipped, but the cost of running
and maintaining the driers got them switched off, with
disastrous consequences that have taken decades to
remediate. The entire building quickly became a mold
farm and rust was rampant even in recently-installed
racking. Because the building had been designed as a
sealed system, there were no windows to open to at
least mitigate the worst effects.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If you have high ambient humidity
that cannot be lowered, therefore, it might be safest
not to cool the room much. This is suboptimal in
conservation terms, but the consequences of lowering
the dew point are rust, mold and other undesirable
results of liquid condensation running down your jars
and over your racks. <o:p>
</o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="background:white"><span
style="font-size:12.0pt;color:black">Paul Callomon<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span
style="font-size:12.0pt;color:black">Collection
Manager, Malacology and General Invertebrates<i><o:p></o:p></i></span></p>
<div class="MsoNormal"
style="text-align:center;background:white"
align="center">
<span style="font-size:12.0pt;color:black">
<hr width="100%" size="2" align="center">
</span></div>
<p class="MsoNormal" style="background:white"><b><span
style="font-size:12.0pt;color:black">Academy of
Natural Sciences of Drexel University</span></b><b><span
style="font-size:12.0pt;color:black"><o:p></o:p></span></b></p>
<p class="MsoNormal" style="background:white"><span
style="font-size:12.0pt;color:black">1900 Benjamin
Franklin Parkway, Philadelphia PA 19103-1195, USA<br>
<i><a href="mailto:prc44@drexel.edu"
moz-do-not-send="true"><span
style="color:#0563C1">prc44@drexel.edu</span></a>
Tel 215-405-5096 - Fax 215-299-1170</i><o:p></o:p></span></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p><br>
</p>
<div class="moz-signature">-- <br>
<p><img src="cid:part2.DC28C292.CCCD7C16@snsb.de" alt=""
width="152" height="59"></p>
<p><br>
Dirk Neumann<br>
<br>
Tel: 089 / 8107-111<br>
Fax: 089 / 8107-300<br>
neumann(a)snsb.de<br>
<br>
Postanschrift:<br>
<br>
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Zoologische Staatssammlung München<br>
Dirk Neumann, Sektion Ichthyologie / DNA-Storage<br>
Münchhausenstr. 21<br>
81247 München<br>
<br>
Besuchen Sie unsere Sammlung:<br>
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<br>
---------<br>
<br>
Dirk Neumann<br>
<br>
Tel: +49-89-8107-111<br>
Fax: +49-89-8107-300<br>
neumann(a)snsb.de<br>
<br>
postal address:<br>
<br>
Bavarian Natural History Collections<br>
The Bavarian State Collection of Zoology<br>
Dirk Neumann, Section Ichthyology / DNA-Storage<br>
Muenchhausenstr. 21<br>
81247 Munich (Germany)<br>
<br>
Visit our section at:<br>
<a class="moz-txt-link-freetext" href="http://www.zsm.mwn.de/sektion/ichthyologie-home/">http://www.zsm.mwn.de/sektion/ichthyologie-home/</a><br>
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