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<div class="moz-cite-prefix">Hello Karen,</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">it might be worth to investigate
inasmuch the ethanol treatment Michelle suggested - or similar
treatments - which help to oxidise the Urushiol at room
temperature; oxidisation and subsequent polymerisation however is
also described as first step in historic varnishes which may
produce a (hard) lacquer layer. There are few sources on the web
describing the oxidisation process even though this plant is not
common in Europe, there might be more resources on the web in if
you use an English based web-domain for the search (which don't
show up here).</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Might be worth to share your results in
case your treatment is successful.<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Best wishes</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 21.12.2018 um 13:52 schrieb
Pinsdorf, Michelle:<br>
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<p class="MsoNormal"><span style="color:#1F497D">Hello Karen,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Assuming that
your mastodon specimens are sub-fossil (or at least highly
porous), they will be affected by soaking or large-volume
applications of water. Since the poison ivy would only have
come in contact with the surface of the specimens anyway, a
drenching wouldn’t be needed.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Urushiol oil is
soluble in ethanol, so an idea would be getting some in a
spray bottle and spritzing the surface of your specimens
with that, after matrix removal but prior to the application
of adhesives or stabilizers that would seal the oil in place
on the specimen surface. Acetone or rubbing alcohol may work
as well. It would be important to do this part under a fume
hood, so that the vapors wouldn’t be inhaled. The quick
evaporation rate of the alcohol should minimize the risk of
damage to the specimens. If spraying the matrix will make it
‘muddy’ and possibly stain or destabilize the fossils, you
could choose to remove the matrix and roots first before
alcohol treatment.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Bagging the
specimens may incur risk of them developing mold, sprouting
new growth from the roots, etc. if the specimens and matrix
contain moisture. Perhaps you weren’t planning on prepping
and stabilizing these specimens for curation in the near
term anyway, but urushiol can remain potent for years. I’m
not aware if there may be testing materials to determine if
the oil has been successfully removed from your specimens
after treatment.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Good luck,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Michelle
Pinsdorf<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D">Michelle
Pinsdorf</span></b><span
style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D">Vertebrate
Fossil Preparator<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D">Department
of Paleobiology<o:p></o:p></span></p>
<p class="MsoNormal"><b><span
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style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D">
202.633.1356</span><span
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href="mailto:pinsdorfm@si.edu" moz-do-not-send="true"><span
style="color:#0563C1">pinsdorfm@si.edu</span></a></span><span
style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial",sans-serif;color:#00C1D5">SMITHSONIAN
INSTITUTION<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial",sans-serif;color:#00778B">NATIONAL
MUSEUM OF NATURAL HISTORY<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Nhcoll-l
<a class="moz-txt-link-rfc2396E" href="mailto:nhcoll-l-bounces@mailman.yale.edu"><nhcoll-l-bounces@mailman.yale.edu></a> <b>
On Behalf Of </b>Karen Morton<br>
<b>Sent:</b> Thursday, December 20, 2018 4:13 PM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:nhcoll-l@mailman.yale.edu">nhcoll-l@mailman.yale.edu</a><br>
<b>Subject:</b> [Nhcoll-l] Mastodon challenge<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Dear List Members,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We recently received a collection of
mastodon bones that were eroding out of a hillside. It turns
out the area they were collected from was completely
surrounded with poison ivy. We’d love to be able to process
them like every other donation, but we have already had one
person break out in a rash just from the initial hand-over.
Does anyone have any recommendations on how to care for these
fossils without endangering staff? Should we just bag them up
as is, label the outside of the packaging, and put warning
signs for future reference (with the specimen AND in the
database records)? The bones have not been cleaned up and
clumps of dirt and roots are still mixed in with them.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any advice will be greatly appreciated.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you in advance.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Sincerely,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span
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214.756.5722 |
</span><a href="mailto:karen.morton@perotmuseum.org"
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<pre class="moz-signature" cols="72">--
Dirk Neumann
Tel: 089 / 8107-111
Fax: 089 / 8107-300
*new email: neumann(a)snsb.de*
Postanschrift:
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Besuchen Sie unsere Sammlung:
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---------
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postal address:
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The Bavarian State Collection of Zoology
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