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<div class="moz-cite-prefix">Hi Paul,<br>
<br>
glass is a amorphous melt which allows small molecules to diffuse
through the glass (compare e.g. stick honey glass jars); same
happens with water, but at the same time water diffuses through
the glass, it carries dissolved ions, too.<br>
<br>
Depending on the surrounding humidity, water evaporates from the
micro water layer of the container surface. If humidity inside the
storage room fluctuates, the evaporations fluctuates, too. If you
have highly polar solvents such as MEK as denaturant in your
alcohol, leaching rather increases and puts the glass under high
physical stress which results in micor-fizzures which will open
into small visible cracks.<br>
<br>
Can show some pictures on this at SPNHC in Berlin if this would be
of interest.<br>
<br>
All the best<br>
Dirk <br>
<br>
<br>
Am 29.10.2015 um 18:10 schrieb Callomon,Paul:<br>
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<p class="MsoNormal">Folks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So here’s a jar question that perhaps
someone has answered:<o:p></o:p></p>
<p class="MsoNormal">In “glass disease” the non-silicate
components of, say, soda glass gradually leach out of the
silicate matrix and onto the surface as hydrated compounds.
This happens more where humidity is high, as water is involved
in the latter stages of the reaction. In vials found in dry
collections, the resulting compounds can be seen as droplets
of moisture on the surface of the glass. They will be on both
the inside and outside if the vial is only stoppered with
cotton, allowing its internal humidity to be close to ambient.
<o:p></o:p></p>
<p class="MsoNormal">Where the jar or vial is full of fluid,
however, the values representing the difference in pressure
between the internal structure of the glass and the external
environment will differ between the interior and exterior. So
the question is: will the rate of migration of the
non-silicate compounds differ accordingly – that is, will they
tend head for the outside of the jar, where the pressure
differential is higher? The answer, if there is one, may have
a bearing on the extent to which glass deterioration will
contaminate the fluid in the jar. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="background:white"><b><span
style="font-size:10.0pt;color:black">Paul Callomon</span></b><span
style="font-size:10.0pt;color:black"><br>
<i>Collection Manager, Malacology, Invertebrate Paleontology
and General Invertebrates</i></span><span
style="color:black"><o:p></o:p></span></p>
<div class="MsoNormal"
style="text-align:center;background:white" align="center">
<span style="font-size:10.0pt;color:black">
<hr align="center" size="2" width="100%">
</span></div>
<p class="MsoNormal" style="background:white"><b><span
style="font-size:10.0pt;color:black">Academy of Natural
Sciences of Drexel University, Philadelphia</span></b><b><span
style="font-size:10.0pt;color:black"><o:p></o:p></span></b></p>
<p class="MsoNormal" style="background:white"><span
style="font-size:10.0pt;color:black">1900 Benjamin Franklin
Parkway, Philadelphia PA 19103-1195, USA</span><span
style="font-size:10.0pt;color:black"><br>
<i><a moz-do-not-send="true" href="mailto:callomon@ansp.org" target="_blank"><span style="color:blue">callomon@ansp.org</span></a>
Tel 215-405-5096 - Fax 215-299-1170</i></span><span
style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<pre class="moz-signature" cols="72">--
Dirk Neumann
Tel: 089 / 8107-111
Fax: 089 / 8107-300
email: Dirk.Neumann(a)zsm.mwn.de
Postanschrift:
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---------
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email: Dirk.Neumann(a)zsm.mwn.de
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