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<div class="moz-cite-prefix">Hi Tonya,</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">my personal thoughts are that this
depends a bit on potentially different expansion coefficients of
the slides embedding agents and cover slips and potentially
unwanted condensation effects when moving the slides out of the
freezers again. <br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Birger Neuhaus at the MfN in Berlin
published a really comprehensive piece on the conservation of
microslides which is available <a moz-do-not-send="true"
href="https://www.biotaxa.org/Zootaxa/article/view/zootaxa.4322.1.1">here</a><br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">He basically says the same cautioning
that mounting media might suffer from shrinkage and also the glass
itself (depending on the quality especially in historic objects)
might be damaged from this harsh temperature shock.</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Hope this helps</div>
<div class="moz-cite-prefix">Dirk<br>
</div>
<div class="moz-cite-prefix"><br>
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<div class="moz-cite-prefix"> ****<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">"<i>Recently, the Museum für Naturkunde
Berlin established in the frame of a pest management program a
quarantine and freezing station for incoming parcels with
special attention to entomological items returned from the
borrower. Material from wet collections and microscope slides
are excluded from this practice, because both mounting media
(Brown 1997, p. 6) and coverslip seals containing polymers
(Shashoua 2008, p. 203) would suffer from shrinkage or formation
of large hexagonal ice crystals, which pierce cell membranes and
the like during the freezing process (Florian 1990; Allington
& Sherlock 2007a, 2007b). The latter authors demonstrated
that damage occurred already after freezing coverslip seals just
a few times. The consequences of these processes have already
been recognized at the Natural History Museum in London (Brown
1997).</i>"<br>
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<div class="moz-cite-prefix"><br>
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<div class="moz-cite-prefix">Am 15.04.2021 um 00:59 schrieb Haff,
Tonya (NCMI, Crace):<br>
</div>
<blockquote type="cite"
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Hello all,</div>
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<br>
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I am wondering if any of you have insight into freezing
everything in a collection before moving in to a new building.
Specifically, I am wondering about things like slides. Are
histology, etc slides safe to be frozen at -30 to -40C? Is there
anything else that I should be thinking about? </div>
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<br>
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Thanks!</div>
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<br>
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<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
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Tonya</div>
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<br>
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<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
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Dr Tonya Haff</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
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Collection Manager</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
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Australian National Wildlife Collection</div>
<br>
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