[Nhcoll-l] vivianite preservation

Tue Apr 24 05:29:40 EDT 2018

The mineral, not the wood.

Thanks!

Met vriendelijke groeten,

Becky Desjardins
Taxidermist/Preparator

T 071-751 9252 , M 06-16144902

Darwinweg 2 - 2333 CR Leiden
E Becky.Desjardins at naturalis.nl I , www.naturalis.nl

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 all visitors,
including Synthesys Access applicants, as well as for all loan requests for
two months during March and April 2016, and for a period of about two
years 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 www.naturalis.nl or contact collectie at naturalis.nl. We
apologize for this inconvenience.

On Tue, Apr 24, 2018 at 10:57 AM, Christian Baars <
Christian.Baars at museumwales.ac.uk> wrote:

> Hi Becky,
>
>
>
> What is more important to preserve, the waterlogged wood or the vivianite?
>
>
>
> 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.
>
>
>
> To preserve the vivianite you would need to contain it in a micro
> environment under high relative humidity and exclusion of oxygen.
>
>
>
> 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.
>
>
>
> Kind regards
>
> Christian
>
>
>
>
>
>
>
> *Dr Christian Baars AMA*
>
> Senior Preventive Conservator
>
> National Museum Cardiff
>
> Department of Collection Services
>
> Cathays Park, Cardiff CF10 4NP, UK
>
> Telephone: +44 (0)29 2057 3302
>
> E-mail: christian.baars at museumwales.ac.uk
>
> Twitter: @NMWPrevCons
>
> Blog: https://urldefense.proofpoint.com/v2/url?u=http-3A__www.museumwales.ac.uk_blog_-3Fcat-3D2484&d=DwIFaQ&c=cjytLXgP8ixuoHflwc-poQ&r=LpYc_Z_iN1KRw0hheb3x6-8MJUMu482qfHowpGYJqwc&m=x8PJnW5f5r8xB32UtInhCuRxqu0D_3MpFIXQaw9ATvI&s=wThjq9BBEY63gMfhg-u7vmA-H_Mxd-Fr6s1VZYRvuss&e=
>
> https://urldefense.proofpoint.com/v2/url?u=https-3A__museum.wales_staff_643_Christian-2DBaars_&d=DwIFaQ&c=cjytLXgP8ixuoHflwc-poQ&r=LpYc_Z_iN1KRw0hheb3x6-8MJUMu482qfHowpGYJqwc&m=x8PJnW5f5r8xB32UtInhCuRxqu0D_3MpFIXQaw9ATvI&s=POY2qEwc_Kucl7ZG3U613T4ptMIEgjcXc5GUx798gK4&e=
>
>
>
>
>
>
>
>
>
> *From:* Nhcoll-l [mailto:nhcoll-l-bounces at mailman.yale.edu] *On Behalf Of
> *Becky Desjardins
> *Sent:* 24 April 2018 07:58
> *To:* nhcoll-l at mailman.yale.edu; Arike Gill <arike.gill at naturalis.nl>
> *Subject:* [Nhcoll-l] vivianite preservation
>
>
>
> Hello all;
>
>
>
> 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.
>
>
>
>
>
>
> Met vriendelijke groeten,
>
>
>
> Becky Desjardins
>
> Taxidermist/Preparator
>
>
>
>
>
>
>
> [image: Image removed by sender.]
>
>
>
> T 071-751 9252 , M 06-16144902
>
>
> Darwinweg 2 - 2333 CR Leiden
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__maps.google.com_-3Fq-3DDarwinweg-2B2-2B-2D-2B2333-2BCR-2BLeiden-26entry-3Dgmail-26source-3Dg&d=DwIFaQ&c=cjytLXgP8ixuoHflwc-poQ&r=LpYc_Z_iN1KRw0hheb3x6-8MJUMu482qfHowpGYJqwc&m=x8PJnW5f5r8xB32UtInhCuRxqu0D_3MpFIXQaw9ATvI&s=cmm-cJVzMkzTTPgLn3oE7OmXBXcK2KSlzw8XTyDi-0k&e=>
> E Becky.Desjardins at naturalis.nl I , www.naturalis.nl
> <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=>
>
>
> *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 all visitors,
> including Synthesys Access applicants, as well as for all loan requests for
> two months during March and April 2016, and for a period of about two years
> 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 **www.naturalis.nl*
> <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=>*
> or contact **collectie at naturalis.nl <collectie at naturalis.nl>**. We
> apologize for this inconvenience.*
>
>
>
>
>
>
>
>
>
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