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<p>Hi Gretchen,</p>
<p>We have used marine epoxy in the past in very specific
circumstances, but I don't personally recall hearing of anyone
here using it on cannel coal. But I guess I can't swear it's
never been done....</p>
<p>We <i>have</i> used it on large dinosaur bones, hundreds of
pounds in weight, where B-72, though reversible, is not
competent. And true chemical reversibility is probably unlikely
when one adds any compound to a fossil. Mechanical reversibility
is possible even with epoxy through mechanical preparation. One
can successfully remove rock matrices in large specimens which are
harder than epoxy.<br>
</p>
<p>BTW, the marine epoxy we've used is not the one you cite. I'd be
happy to give the url of the product we've used on large bones to
anyone interested. But for thin cannel coal specimens, I agree,
epoxy is not appropriate. B-72 with a reinforcing fiber of some
kind would be preferable.<br>
</p>
<p>Best,</p>
<p>Bill<br>
</p>
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<div class="moz-cite-prefix">On 6/18/24 3:59 PM, Anderson, Gretchen
wrote:<br>
</div>
<blockquote type="cite"
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<p class="MsoNormal"><span
style="color:#242424;background:white">Dear Colleagues,
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#242424;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#242424;background:white">I just received
this question from my vertebrate paleontology department
and am looking for thoughts on how to better stabilize
these fragile specimens. The specimens are fragile and
some are extremely thin. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#242424;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#242424;background:white">A Research
Associate in VP would like to use a </span><a
href="https://www.jbweld.com/product/marineweld-syringe"
target="_blank" moz-do-not-send="true"><span
style="color:blue;border:none windowtext 1.0pt;padding:0in;background:white">marine
epoxy</span></a><span
style="color:#242424;background:white"> to stabilize thin
pieces of cannel coal that contain impressions of fossils.
His practice is to coat the back of the fossil with a
thick layer of the epoxy. He mentioned that this system
had been used at the Field Museum. The specimens are
studied by either making a latex peel of them or a CT-scan
to yield a positive of the impression. The plan to go
forward is to use CT scanning rather than latex peel, when
possible. The RA champing at the bit to stabilize a few
specimens. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#242424;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#242424;background:white">I am concerned
about continuing the use of epoxy and would much rather
use a method that is more conservation friendly. I would
like to suggest a different way to do this, perhaps using
a material like remay or a light carbon steel fabric with
Paraloid B-72, lining the back of the fossil to provide
improved stability. This would be reversible. We are
currently testing this on some scrap pieces of the coal.
</span><span
style="font-size:12.0pt;font-family:"Aptos",sans-serif;color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="color:#242424;background:white">What are the
standards for preparing this kind of fossil? Does anyone
have experience with this type of epoxy? If so, how stable
is it?<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#242424;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#242424;background:white">Any and all advice
would be greatly appreciated.
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#242424;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#242424;background:white">Thanks!<o:p></o:p></span></p>
</div>
<div id="Signature">
<p><b><span style="font-size:14.0pt">Gretchen Anderson</span></b><o:p></o:p></p>
<p><b><span style="font-size:14.0pt">Conservator</span></b><o:p></o:p></p>
<p><b><span style="font-size:14.0pt">Carnegie Museum of
Natural History</span></b><o:p></o:p></p>
<p><b><span style="font-size:14.0pt"><a class="moz-txt-link-abbreviated" href="mailto:Andersong@CarnegieMNH.Org">Andersong@CarnegieMNH.Org</a></span></b><o:p></o:p></p>
<p> <o:p></o:p></p>
</div>
</div>
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