MOROPUS Posted April 30, 2009 Share Posted April 30, 2009 Hi, all! This weekend I will be searching in a Lower Carboniferous place-Cantabrian-a part of lower Stephaniensean (in the spare time during a touristic tour through the region), specially abundant in crinoids, corals, among other things. My question is: How can I clean crinoids on hard grey limestone? Acetic acid would be a good help, or only mechanical cleaning is prefered? Thanks in advance Link to comment Share on other sites More sharing options...
ashcraft Posted April 30, 2009 Share Posted April 30, 2009 If the fossils are silicic, you can use acid, otherwise mechanical, in my experience. Brent Ashcraft ashcraft, brent allen Link to comment Share on other sites More sharing options...
fosceal2 Posted May 11, 2009 Share Posted May 11, 2009 Through trial and error I learned that the fossils in limestone from West VA are not silicified and therefore the following will destroy them- Hydrochloric acid ( Ie Muriatic acid Caution Toxic), Aqua Regia ( I am a jewelry store owner and was in a hurry- SEEMED like a good idea) Oh and coating them with fingernail polish first does not help. So back to my Dremel and dremel engraver. I find working wet limestone easier and when I get frustrated I put them out back and let the winter work on them. Best regards, Fosceal Link to comment Share on other sites More sharing options...
FossilAndTreasureHunter Posted November 6, 2017 Share Posted November 6, 2017 What ended up working? I am planning on using an engraving pen. Link to comment Share on other sites More sharing options...
ynot Posted November 6, 2017 Share Posted November 6, 2017 33 minutes ago, FossilAndTreasureHunter said: What ended up working? I am planning on using an engraving pen. This thread is 8 years old. You may not get any replies. You can start Your own thread to get better results. 1 Link to comment Share on other sites More sharing options...
FossilAndTreasureHunter Posted November 6, 2017 Share Posted November 6, 2017 Thanks. Most of the threads I'm viewing are many years old. Don't know why. Link to comment Share on other sites More sharing options...
ynot Posted November 6, 2017 Share Posted November 6, 2017 2 minutes ago, FossilAndTreasureHunter said: Thanks. Most of the threads I'm viewing are many years old. Don't know why. The Fossil Forum site goes back to 2007(?) and all of the threads have been saved. They are ordered by the date of the last post in the threads. In the list of topics within a subforum the most recent activity will be on the first page, the following pages have progressively older threads. If it is one of the lesser used subforums it does not take long to get into old threads. Then there are the older threads that have had more recent activity in there also. As for cleaning fossils, it is much dependent on the type of preservation and matrix. If You post pictures and give a location it will help the people that reply. Tony Link to comment Share on other sites More sharing options...
FossilAndTreasureHunter Posted November 6, 2017 Share Posted November 6, 2017 Thanks so much Tony 1 Link to comment Share on other sites More sharing options...
Haravex Posted November 6, 2017 Share Posted November 6, 2017 5 hours ago, FossilAndTreasureHunter said: Thanks so much Tony What type of fossils are you looking at prepping or cleaning up? Link to comment Share on other sites More sharing options...
FossilAndTreasureHunter Posted November 6, 2017 Share Posted November 6, 2017 2 hours ago, Haravex said: What type of fossils are you looking at prepping or cleaning up? East Tennessee hard, grey, limestone. Mainly Crinoids. And an object I'm not sure of. Link to comment Share on other sites More sharing options...
Haravex Posted November 6, 2017 Share Posted November 6, 2017 Personally I would use a combination of air scribe and an air eraser if you have access to these tools, I would wait for further replies as that limestone might be silica and there for you could use a diluted acid. Link to comment Share on other sites More sharing options...
Wrangellian Posted November 23, 2017 Share Posted November 23, 2017 On 11/6/2017 at 3:03 AM, FossilAndTreasureHunter said: East Tennessee hard, grey, limestone. Mainly Crinoids. And an object I'm not sure of. Hope it's not too late to comment, I see some crinoidy bits in this 2nd pic but the thing in the first pic I would be willing to bet is more of a trace fossil kind of thing. I don't see any of the structural elements (ossicles) that I would expect to see in a crinoid. Link to comment Share on other sites More sharing options...
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