[Nhcoll-l] Stabilizing cannel coal
William Simpson
wsimpson at fieldmuseum.org
Tue Jun 18 18:12:00 EDT 2024
Hi Gretchen,
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....
We /have/ 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.
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.
Best,
Bill
*
William F. Simpson (he)*
Head of Geological Collections
McCarter Collections Manager, Fossil Vertebrates
Gantz Family Collections Center
*Field Museum of Natural History*
1400 South DuSable Lake Shore Drive
Chicago, IL. 60605
(312) 665-7628
fieldmuseum.org <https://www.fieldmuseum.org>
Field Museum Logo <www.fieldmuseum.org>
On 6/18/24 3:59 PM, Anderson, Gretchen wrote:
>
> Dear Colleagues,
>
> 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.
>
> A Research Associate in VP would like to use a marine epoxy
> <https://www.jbweld.com/product/marineweld-syringe> 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.
>
> 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.
>
> 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?
>
> Any and all advice would be greatly appreciated.
>
> Thanks!
>
> *Gretchen Anderson*
>
> *Conservator*
>
> *Carnegie Museum of Natural History*
>
> *Andersong at CarnegieMNH.Org*
>
>
>
>
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