Hi there folks,
I need help and advices on how to prep some echinoids that I have found on calcarenite matrix. I am new in fossil prep plus I know these kind of calcarenites are very sneaky to treat. In the picture below there is a Scutella subrotundae before and after a quick prep-test I did with a couple of nails. The problem now is to take away the sand grains very close to the shell. Which technique should I try to follow now? I am thinking to the digestion in cold acetic acid, which I know it is used to extract microfossils from limestones and calcarenites, but I do not know if it works with macro stuff too.
Thank you in advance,
Daniele