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<div class="moz-cite-prefix">Dear Truth,</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">the stoppers that are self-sealed and
jammed can be opened by putting them under the tap and let hot
water (approx. 40-50 °C) run on the stopper / neck of the jar. In
case you have external labels attached to the outside of the jar,
it is worth testing if they peel of or the ink starts bleeding
(ah, Paul was faster with his reply :-)</div>
<div class="moz-cite-prefix"><br>
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<div class="moz-cite-prefix">The hot water widens the neck
(expansion of the glass) while inside the jar the trapped gases
expand and increase the internal pressure - be aware that up to
2bar of more could build up inside alcohol filled jars causing the
jammed stopper to rocket-off in rare cases.</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Silicone glued jars are more delicate.
If the silicone is thick enough, you can use a sharp pointed knife
to cut the glue between stopper and neck; never tried this in
stoppered jars, in flanged jars you could carefully cut the lid of
with sharp blades like scalpel, sharpened palette-knifes. There
might be some chemical agents which could remove the silicone, but
the issue here is that these may contaminate the holding fluid.</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>
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<div class="moz-cite-prefix">Am 15.10.2019 um 21:45 schrieb Truth
Muller:<br>
</div>
<blockquote type="cite"
cite="mid:CAGM3ZCfb689NvopzO5DZQhFxHk+4GqT6Kf5gPp5P0h9gFZy66g@mail.gmail.com">
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<div class="gmail_default" style="font-family:trebuchet
ms,sans-serif;font-size:small">Hello,</div>
<div class="gmail_default" style="font-family:trebuchet
ms,sans-serif;font-size:small"><br>
</div>
<div class="gmail_default" style="font-family:trebuchet
ms,sans-serif;font-size:small">I am currently one of a small
team of students from College of the Atlantic doing extensive
restoration work on the George B. Dorr Natural History Museum
collections. We are preparing the entirety of the Museum's
collections to be moved to a new, modern storage facility
which is still under construction. </div>
<div class="gmail_default" style="font-family:trebuchet
ms,sans-serif;font-size:small"><br>
</div>
<div class="gmail_default" style="font-family:trebuchet
ms,sans-serif;font-size:small">I am responsible for the
Ichthyological and Marine Invertebrates wet collections, which
have unfortunately suffered from neglect over the past 10-15
years. Only about 60-70% of the Ichthyological collection
specimens are in modern jars with screw-top lids, and the rest
are in e in much older jars with ground glass stoppers. Some
of them are sealed with silicone, a few with an unidentified
wax, and others have simply self-sealed with their own fluids
congealing between the jar and the stopper. Many of these jars
need to be topped off, and a few are cracked and urgently need
to be replaced, but almost every single stopper is stuck fast
as though super-glued. We have not yet found a way to open
them without putting the specimens inside in harm's way.</div>
<div class="gmail_default" style="font-family:trebuchet
ms,sans-serif;font-size:small"><br>
</div>
<div class="gmail_default" style="font-family:trebuchet
ms,sans-serif;font-size:small">What is the best method that we
can use to open these jammed jars, preserving the specimen,
and, ideally, the jars as well? Any help or advice would be
greatly appreciated!</div>
<div class="gmail_default" style="font-family:trebuchet
ms,sans-serif;font-size:small"><br>
</div>
<div class="gmail_default" style="font-family:trebuchet
ms,sans-serif;font-size:small">~Truth Muller</div>
<div class="gmail_default" style="font-family:trebuchet
ms,sans-serif;font-size:small">George B. Dorr Museum of
Natural History</div>
<div class="gmail_default" style="font-family:trebuchet
ms,sans-serif;font-size:small">College of the Atlantic '21</div>
<div class="gmail_default" style="font-family:trebuchet
ms,sans-serif;font-size:small"><br>
</div>
<div class="gmail_default" style="font-family:trebuchet
ms,sans-serif;font-size:small"><br>
</div>
</div>
<br>
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</blockquote>
<p><br>
</p>
<pre class="moz-signature" cols="72">--
Dirk Neumann
Tel: 089 / 8107-111
Fax: 089 / 8107-300
*new email: neumann(a)snsb.de*
Postanschrift:
Staatliche Naturwissenschaftliche Sammlungen Bayerns
Zoologische Staatssammlung München
Dirk Neumann, Sektion Ichthyologie / DNA-Storage
Münchhausenstr. 21
81247 München
Besuchen Sie unsere Sammlung:
<a class="moz-txt-link-freetext" href="http://www.zsm.mwn.de/sektion/ichthyologie-home/">http://www.zsm.mwn.de/sektion/ichthyologie-home/</a>
---------
Dirk Neumann
Tel: +49-89-8107-111
Fax: +49-89-8107-300
*new email: neumann(a)snsb.de*
postal address:
Bavarian Natural History Collections
The Bavarian State Collection of Zoology
Dirk Neumann, Section Ichthyology / DNA-Storage
Muenchhausenstr. 21
81247 Munich (Germany)
Visit our section at:
<a class="moz-txt-link-freetext" href="http://www.zsm.mwn.de/sektion/ichthyologie-home/">http://www.zsm.mwn.de/sektion/ichthyologie-home/</a>
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