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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Hi Becky,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">What is more important to preserve, the waterlogged wood or the vivianite?
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Vivianite is an iron-phosphate mineral often associated with archaeological objects (i.e. waterlogged wood and skeletons), as it can
form from the oxidation of pyrite and in association with phosphate-rich minerals (e.g. bone). Vivianite is originally clear but oxidises quickly and then turns blue. It also contains 8 molecules of crystalline water per molecule of mineral, and is therefore
prone to dehydration. If waterlogged wood (which itself is preserved because it would have been buried in an anoxic environment) is exposed to the atmosphere, the oxidation and associated colour change in vivianite can happen quite quickly. Dehydration of
vivianite can result in cracking and physical disintegration. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">To preserve the vivianite you would need to contain it in a micro environment under high relative humidity and exclusion of oxygen.
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">If you were more interested in preserving the waterlogged wood, any of the usual ways for doing so (e.g., impregnation, replacement
of water with non-aqueous solvents, freeze drying) would be mutually exclusive with the preservation of vivianite.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Kind regards<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Christian
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<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Tahoma",sans-serif;color:#1F497D">Dr Christian Baars AMA<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:7.0pt;font-family:"Tahoma",sans-serif;color:#1F497D">Senior Preventive Conservator<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.0pt;font-family:"Tahoma",sans-serif;color:#1F497D">National Museum Cardiff<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.0pt;font-family:"Tahoma",sans-serif;color:#1F497D">Department of Collection Services<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.0pt;font-family:"Tahoma",sans-serif;color:#1F497D">Cathays Park, Cardiff CF10 4NP, UK<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.0pt;font-family:"Tahoma",sans-serif;color:#1F497D">Telephone: +44 (0)29 2057 3302<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.0pt;font-family:"Tahoma",sans-serif;color:#1F497D">E-mail:
<a href="mailto:christian.baars@museumwales.ac.uk"><span style="color:#0563C1">christian.baars@museumwales.ac.uk</span></a>
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<p class="MsoNormal"><span style="font-size:7.0pt;font-family:"Tahoma",sans-serif;color:#1F497D">Twitter: @NMWPrevCons
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<p class="MsoNormal"><span style="font-size:7.0pt;font-family:"Tahoma",sans-serif;color:#1F497D">Blog:
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.museumwales.ac.uk_blog_-3Fcat-3D2484&d=DwMGaQ&c=cjytLXgP8ixuoHflwc-poQ&r=LpYc_Z_iN1KRw0hheb3x6-8MJUMu482qfHowpGYJqwc&m=PCIrsy3dDUBu0h0xYSJC7E9ZMRrsq4XijIMIZKFFh2I&s=ZRvZOniCKG6lB0Jfm3s_Zdr5vfWAbU-dwrW-8lMPWCA&e="><span style="color:#0563C1">http://www.museumwales.ac.uk/blog/?cat=2484</span></a>
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<p class="MsoNormal"><span style="font-size:7.0pt;font-family:"Tahoma",sans-serif;color:#1F497D"><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__museum.wales_staff_643_Christian-2DBaars_&d=DwMGaQ&c=cjytLXgP8ixuoHflwc-poQ&r=LpYc_Z_iN1KRw0hheb3x6-8MJUMu482qfHowpGYJqwc&m=PCIrsy3dDUBu0h0xYSJC7E9ZMRrsq4XijIMIZKFFh2I&s=WSe7K17VZFvk8akPXD0jT-uB_gRJXLLs5MssbrjZLyc&e="><span style="color:#0563C1">https://museum.wales/staff/643/Christian-Baars/</span></a>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Nhcoll-l [mailto:nhcoll-l-bounces@mailman.yale.edu]
<b>On Behalf Of </b>Becky Desjardins<br>
<b>Sent:</b> 24 April 2018 07:58<br>
<b>To:</b> nhcoll-l@mailman.yale.edu; Arike Gill <arike.gill@naturalis.nl><br>
<b>Subject:</b> [Nhcoll-l] vivianite preservation<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">Hello all;<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">One of our curators recently collected a sample of waterlogged wood (could be clay) with crystals of vivianite on it. Vivianite changes color when exposed to air (which is already happening) and the wood/clay
is drying out. Does anyone have any tips for how to preserve it? Keep it in glycerine? Or oil? I welcome your suggestions. <o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">Met vriendelijke groeten,<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">Becky Desjardins<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">Taxidermist/Preparator<o:p></o:p></p>
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<p style="margin-left:36.0pt"><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black;background:white">T 071-751 9252</span><span style="font-size:7.5pt;color:black"> , M 06-16144902</span><o:p></o:p></p>
<p style="margin-left:36.0pt"><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black"><br>
Darwinweg 2 - 2333 CR Leiden<br>
E <a href="mailto:Becky.Desjardins@naturalis.nl" target="_blank">Becky.Desjardins@naturalis.nl</a> I , <a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.naturalis.nl_&d=DwMFaQ&c=cjytLXgP8ixuoHflwc-poQ&r=LpYc_Z_iN1KRw0hheb3x6-8MJUMu482qfHowpGYJqwc&m=9gG_DklWLxsTRW4hBfOVfu37farkF4kFuQi8IKeNO0Y&s=SjnEWfoDPTAf6RfRqX33-beWwzQ3nWO5sTM9_X9FAb0&e=" target="_blank">www.naturalis.nl</a> </span><o:p></o:p></p>
<p style="margin-left:36.0pt"><b><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black">Due to the construction of new public museum facilities, depots, labs and offices, the zoological, geological and paleontological collections of Naturalis
Biodiversity Center in Leiden will be closed to <i>all </i>visitors, including Synthesys Access applicants, as well as for
<i>all </i>loan requests for two <i>months </i>during March and April 2016, and for a period of about two
<i>years </i>from August 2016 till summer 2018. The botany collections, housed elsewhere in Leiden, will remain open to visitors and available for loans until further announcement. In case of logistic questions and updates on planning and progress, please check
</span></b><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.naturalis.nl_&d=DwMFaQ&c=cjytLXgP8ixuoHflwc-poQ&r=LpYc_Z_iN1KRw0hheb3x6-8MJUMu482qfHowpGYJqwc&m=9gG_DklWLxsTRW4hBfOVfu37farkF4kFuQi8IKeNO0Y&s=SjnEWfoDPTAf6RfRqX33-beWwzQ3nWO5sTM9_X9FAb0&e=" target="_blank"><b><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1155CC">www.naturalis.nl</span></b></a><b><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black">
or contact </span></b><b><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1155CC"><a href="mailto:collectie@naturalis.nl" target="_blank"><span style="color:#1155CC">collectie@naturalis.nl</span></a></span></b><b><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black">.
We apologize for this inconvenience.</span></b><o:p></o:p></p>
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