Teeth during acid preparation

So many? This is a very rich layer! I have etched some blocks from France to get some teeth, but there is much less and it`s all submillimetric, and roots are almost always missing. What acid and procedure do you use by the way?

3 hours ago, LSG Lab said:

So many? This is a very rich layer! I have etched some blocks from France to get some teeth, but there is much less and it`s all submillimetric, and roots are almost always missing. What acid and procedure do you use by the way?

Indeed! This matrix is incredibly rich. I just use acetic acid for this material. 

For the sandstone I extract fossils from, I use very diluted acetic acid, and add calcium acetate (results from the reaction of acetic acid with calcium carbonate: limestone etc). This allows the acid solution to impregnate the rock before reacting instead of reacting only with the surface, and makes the rock fall apart faster. It is also more gentle with fossils, not making a lot of bubbles and not being so aggressive (I even find foramenifera!). When the solution is used up, I simply add some acid into it.