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<div class="moz-cite-prefix">Hi Liz,</div>
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<div class="moz-cite-prefix">you could also consider mild dry heating of the soil samples, i.e. not higher then 80°C, but well above 45 °C. Freezing might help to remove the humidity, but freezing itself is not inactivating mould and mould spores. Usually,
dry heat at 120°C is a common treatment against mould, but of course not within the museum world as most objects would be severely damaged or destroyed.</div>
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<div class="moz-cite-prefix">Microwave treatment might be another option, there is a paper where microwave treatment was used for archaeological material (<a href="https://www.researchgate.net/publication/269398317_Microwave_treatment_of_mold_on_travertine_Study_of_efficiency_of_the_process">link</a>);
the treatment might be incomplete though, as it might only deactivate some enzymes but not the mould per se. But it might be worth looking into this.</div>
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<div class="moz-cite-prefix">With best wishes</div>
<div class="moz-cite-prefix">Dirk<br>
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<div class="moz-cite-prefix">Am 21.07.2024 um 18:06 schrieb Lu Allington-Jones:</div>
<blockquote type="cite" cite="mid:LO4P265MB6984C13D773205ED9D0B69ACEBAF2@LO4P265MB6984.GBRP265.PROD.OUTLOOK.COM">
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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hi Liz, <o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Have you considered UV light treatment?
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><a href="https://geocollnews.wordpress.com/2024/01/02/mould-in-geological-collections/" moz-do-not-send="true" class="moz-txt-link-freetext">https://geocollnews.wordpress.com/2024/01/02/mould-in-geological-collections/</a>
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Best wishes, <o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Lu<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal" style="margin-bottom:12.0pt">On 19 Jul 2024, at 22:20, Melicker, Liz <<a href="mailto:lmelicker@presidiotrust.gov" moz-do-not-send="true" class="moz-txt-link-freetext">lmelicker@presidiotrust.gov</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif"></span> <span style="font-size:12.0pt">
<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a name="_Hlk139469935" moz-do-not-send="true">Hi Listers –
<o:p></o:p></a></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:_Hlk139469935">We have some archaeological soil samples in our collections that either have had or currently have active mold growth (about 3 cubic feet
of material total, in 250-500 g cloth bags). We’ve quarantined them away from other collection items, but are looking to see whether there are any treatments that can be used to arrest the active biological growth, without compromising future analysis (e.g.,
archaeoparasitology, palynology, geochemistry, etc.). <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:_Hlk139469935">The conservation studio we work with does not work on soil, and suggested anoxia treatment likely won’t work. They suggested that desiccating
the samples then spraying them with ethanol might work. We’ve also heard freezing is an option. And of course, going forward, we’re working with our archaeology team to implement preventative procedures when soil samples are collected so that we avoid this
issue. <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:_Hlk139469935">Does anyone have experience with a similar situation and have advice with treatment that worked, or didn’t work, particularly with an eye
toward preserving future research potential?<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:_Hlk139469935">Thanks in advance –
<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:_Hlk139469935">Warmly - <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:_Hlk139469935">Liz
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk139469935"><b>Liz N. Melicker</b> she/her<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk139469935"><i>LIHZ MEHL-ih-ker
</i><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk139469935">Curator<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk139469935"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk139469935">Presidio Trust<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk139469935">Attn: Liz Melicker<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk139469935">1750 Lincoln Boulevard<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk139469935">San Francisco, CA 94129<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk139469935">t. (415) 561-5300<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk139469935">m. (415) 471-5007<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk139469935"></span><a href="http://www.presidio.gov/" moz-do-not-send="true"><span style="mso-bookmark:_Hlk139469935"><span style="color:#0563C1">presidio.gov</span></span><span style="mso-bookmark:_Hlk139469935"></span></a><span style="mso-bookmark:_Hlk139469935"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk139469935"></span><a href="https://www.facebook.com/presidiosf" moz-do-not-send="true"><span style="mso-bookmark:_Hlk139469935"><span style="color:#0563C1">Facebook</span></span><span style="mso-bookmark:_Hlk139469935"></span></a><span style="mso-bookmark:_Hlk139469935">
| </span><a href="https://www.instagram.com/presidiosf/" moz-do-not-send="true"><span style="mso-bookmark:_Hlk139469935"><span style="color:#0563C1">Instagram</span></span><span style="mso-bookmark:_Hlk139469935"></span></a><span style="mso-bookmark:_Hlk139469935">
| </span><a href="https://www.linkedin.com/company/presidio-trust/" moz-do-not-send="true"><span style="mso-bookmark:_Hlk139469935"><span style="color:#0563C1">LinkedIn</span></span><span style="mso-bookmark:_Hlk139469935"></span></a><span style="mso-bookmark:_Hlk139469935"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk139469935"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk139469935"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk139469935"><span style="font-size:9.0pt;color:#009900"> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk139469935"><span style="font-size:9.0pt">Sent from the traditional territory of the
<i>Yelamu</i>, a local tribe of </span></span><a href="https://www.ramaytush.org/" moz-do-not-send="true"><span style="mso-bookmark:_Hlk139469935"><i><span style="font-size:9.0pt;color:#0563C1">Ramaytush Ohlone</span></i></span><span style="mso-bookmark:_Hlk139469935"></span></a><span style="mso-bookmark:_Hlk139469935"><span style="font-size:9.0pt">
</span></span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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NHCOLL-L is brought to you by the Society for the Preservation of
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mission is to improve the preservation, conservation and management of
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society. See <a class="moz-txt-link-freetext" href="http://www.spnhc.org">http://www.spnhc.org</a> for membership information.
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