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<div class="moz-cite-prefix">Hi Mandy,</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">sounds to me like weathering of the
glass surface (dish-washer effect); likely as Simon indicate
triggered from low pH of the formaldehyde solution (and potential
secondary reactions).</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">If this is para-formaldehyde, it should
look like a needle-like crystals or a crystalline precipitation on
the glass surface, but judging from your description it seems to
be glass corrosion (especially occurring in less chemically inert
in soda-lime glass).</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">If this is the case, you can't brush it
off; if the jars are still stable, you may use them to store
specimens in with less polar preservation fluids (we have some
poor post-WWII cylinders with clear signs of weathering which
still do their job).<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">My two cents</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>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Am 03.03.2021 um 16:16 schrieb Simon
Moore:<br>
</div>
<blockquote type="cite"
cite="mid:735696B5-B57F-4A8E-ADB5-C313D943F30F@btinternet.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
Hi Mandy,
<div class=""><br class="">
</div>
<div class="">If this is a formalin residue then it’s likely a
para-formaldehyde polymer. If so, then it will gradually
dissolve away in preserving strength alcohol but it takes a week
at least. </div>
<div class=""><br class="">
</div>
<div class="">If not, then it might also be a reaction, over time,
of the formalin with the glass whereby the formalin slowly
leaches alkali from the glass. If this is the case, then I’m
regretfully stumped but someone else may know better!</div>
<div class=""><br class="">
<div class=""><span style="font-family: Helvetica; font-size:
12px; font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans: auto;
text-align: start; text-indent: 0px; text-transform: none;
white-space: normal; widows: auto; word-spacing: 0px;
-webkit-text-size-adjust: auto; -webkit-text-stroke-width:
0px; text-decoration: none; caret-color: rgb(0, 0, 0);
color: rgb(0, 0, 0);">With all good wishes, Simon<br
class="">
<br class="">
Simon Moore MIScT, RSci, FLS, ACR<br class="">
Conservator of Natural Sciences and Cutlery Historian,</span><br
class="">
<br class="">
<a href="http://www.natural-history-conservation.com" class=""
moz-do-not-send="true">www.natural-history-conservation.com</a><br
class="">
<br class="">
<span></span><br class="">
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id="ED79A89B-9D5A-4B43-8E89-2458B0C87A94"
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class="">
</div>
<br class="">
<blockquote type="cite" class="">On 3 Mar 2021, at 05:59, Mandy
Reid <<a href="mailto:Mandy.Reid@Australian.Museum"
class="" moz-do-not-send="true">Mandy.Reid@Australian.Museum</a>>
wrote:<br class="">
<br class="">
Hi<br class="">
I am wondering if anyone has a simple method for cleaning
glass vials that have become clouded or appear to contain
flaky reside after they have been in formalin solution for
some time.<br class="">
<br class="">
We are currently switching our specimens from formalin to
ethanol and don’t want to wastefully discard reusable glass
that is still intact and strong, but clearly etched
in formalin solution over time.<br class="">
<br class="">
I am currently trying dilute bleach. Any other suggestions
other than a lot of scrubbing?<br class="">
<br class="">
Thanks<br class="">
Mandy<br class="">
<br class="">
<br class="">
Dr Mandy Reid<br class="">
Collection Manager | Malacology<br class="">
Australian Museum 1 William Street Sydney NSW 2010 Australia <br
class="">
T 61 2 9320 6412 M 61 431 829 842<br class="">
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class="">
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