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Bone-or-Stone
Hi, what's the best way to clean up this fossil?
I've soaked and brushed it gently to remove the easy bits and on a different one I tried picking it off with a knife, but the shell flicks off very easy. Click image for larger version - Name: IMG_5005.jpg, Views: 37, Size: 1002.87 KB Click image for larger version - Name: IMG_5006.jpg, Views: 38, Size: 1.16 MB
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Brittle Star
Hi

Try a mounted needle.
JW

 Never ask a star fish for directions
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Bone-or-Stone
Ok, thanks
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prep01
Hello, you don't say where this is from or what the matrix is!
I take it you know that it is an echinoid (sea urchin).
Ideally this would be very quick and easy to prep with an air abrador, but not everyone has access to one, so if it's in chalk I would put it in a 5% acetic acid solution, for a while, agitating with a toothbrush occasionallybut making sure you don't dissilve the actual test (shell) and rinse occasionally and replace the acid.
Don't go too mad - many echinoids have bryozoa / shells attached to them.
It's all down to experience I'm afraid.
Colin Huller
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Bone-or-Stone
Hi, yeah unfortunately I don’t have an air abrador (one day) this is the geology of where it’s from. Click image for larger version - Name: 2E3232C4-D607-468E-8CFB-5060B017A76C.png, Views: 24, Size: 261.60 KB
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brym
I've used powdered potassium hydroxide on Nucleolites embedded in Oolitic Limestone.

Brian
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prep01
Yes, I'd go with Nucleolites as well, but not had any Oolitic limestone to prep for many a decade, but I'd agree with Brian.
Colin Huller
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Richard
Hi 
I think this is Nucleolites scutatus and probably from sandy Corallian stratum.
I find these are easily damaged - as you say the shell comes off easily - so I just give them a gentle clean with a paintbrush.
Richard
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