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doushantuo

nice work,D

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Manticocerasman

nice, what kind of acid do you use on them?

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DPS Ammonite
2 minutes ago, Manticocerasman said:

nice, what kind of acid do you use on them?

Muriatic AKA HCl acid. The people at the hardware store must think that I have a really large pool with all the acid that I buy from them. 

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doushantuo

be careful with the acid

don't drop it

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DPS Ammonite
3 minutes ago, doushantuo said:

be careful with the acid

don't drop it

I never drop it. When I spill it I always have lots of water nearby to dilute it.

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Ludwigia

Congrats on that unique find. Are the fossils silicified?

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Ruger9a

Awesome find and fantastic prep work.  Do you neutralize the Muriatic acid on the fossil with a liquid solution of baking soda and then rinse thoroughly or just rinse? 

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Monica

What exquisite echinoderms!!!  Congratulations on the awesome find and well done on the prep!

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DPS Ammonite
1 hour ago, Ludwigia said:

Congrats on that unique find. Are the fossils silicified?

Yes.

1 hour ago, Ruger9a said:

Awesome find and fantastic prep work.  Do you neutralize the Muriatic acid on the fossil with a liquid solution of baking soda and then rinse thoroughly or just rinse? 

I just soak in fresh water for a period at least twice as long as it was in the acid changing the water a couple of times. Often the acid solution has been neutralized by the limestone when I take the fossil out. Soaking in water gets rid of the salt, calcium chloride. Insufficient soaking produces fossils that grow lots of needle like crystals.

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Ruger9a
35 minutes ago, DPS Ammonite said:

Yes.

I just soak in fresh water for a period at least twice as long as it was in the acid changing the water a couple of times. Often the acid solution has been neutralized by the limestone when I take the fossil out. Soaking in water gets rid of the salt, calcium chloride. Insufficient soaking produces fossils that grow lots of needle like crystals.

Thanks!

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FossilDAWG

How much do you dilute the acid?  HCL is pretty harsh compared to acetic or formic acid, unless it is diluted a lot.

 

Don

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Shamalama

Very cool looking Crinoids. Some of the detail is very nice too. 

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DPS Ammonite
7 minutes ago, FossilDAWG said:

How much do you dilute the acid?  HCL is pretty harsh compared to acetic or formic acid, unless it is diluted a lot.

 

Don

Starting with a 29% solution, I dilute it to a 10-20% solution. If the fossil is fragile, I use a lower concentration of acid to prevent concussion fracturing from the bubbles forming and popping. The biggest problem with the higher concentration solutions is from overtopping the container from the vigorous bubbles and organic slime from the limestone.

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Fossildude19

Very nice prep work and awesome find, John!

Thanks for posting it!

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Peat Burns

:default_faint:

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