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Steve84
Hello im attempting to stabilise and protect my find as it seems to have much of its shell intact and being mineral based either Aragonite or calcite im not expereinced with telling the difference or identification of the mineral but im concerned about it degrading further as small bits fall off from time to time away from the mold and i would im guessing need a treatment that isnt harsh on or dissolve the shell.

Thanks in advance.

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prep01
Hello Steve, I'm afraid I haven't collected from the Cromarty Jurassic so I am unable to determine whether or not  your ammonite is Pyritic which would influence the conservation method, but it seems that you are more concerned with the shell which is almost certainly Aragonite. The best method is to stop it flaking by painting it with a 5% solution (wy / volume) of Paraloid B72 in pure Acetone. If Paraloid is a problem, then a thin wash of a propriatry varnish (diluted in its oeiginal solvent). Tjere are 2 'problems' with using varnish - 1) it is not reversable & 2) it will be shiny and may well discolour over time.
Colin Huller
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nomadiclifeguide
I would paint it with a 10% solution of paraloid.
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Steve84
Thanks for the replies from the cromarty area i got the fossil from there seems to be no signs of pyrite there is a band of shale that is full of smaller ammonite but its too fragile and the specimens crumble the stone in which my fossil is attached to looks to be mud stone with hexagonal chunks stuck together, there was a clay like substance covering much of the face of the fossil which came off in fresh water and a gentle toothbrush but that stuff stank to high heavens.
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Steve84
Just spoken to my local Museum Curator and they would like to display it on temp loan and have suggested the following.

"Our conservator says she would be happy to look at it – and with your agreement possibly try some consolidation with Paraloid to help stabilise the surface. This is a conservation quality inert acrylic resin with long term stability, it is used in solvent (usually acetone and industrial methylated spirit) and does not give off any acidic components that would affect calcite or aragonite. The only issue might be the weight of the mould.

It would be assessed and done as part of a temporary loan as the museum contribution"

So by letting them have it on loan for some of their upcoming displays they are prepared to do the preservation work free.
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prep01
Good, but they ain't giving much away!
Colin Huller
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nomadiclifeguide
Thats quite a lot of fuss for an incomplete specimen. Small museum? would take seconds to just paint it with paraloid.
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Steve84
I was dealing with a curator who admitted she deals with people more than the actual specimens so im guessing she is only quoting roughly what she understood from the conservationist. Sounds like they are going to do what you guys have suggested but iv requested that they contact me after they have done the assessment to confirm. Personally im new to all this and i don't feel confident doing the prep work myself with no smaller examples to practice on.

However thank you for your advice to my post its much unappreciated.
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