Remove glue from trilobites

[Nipponites]

Hello,

I have recently acquired three calymenes from Morocco, one of them was broken (or composited), and glued. To hide the glue, it was covered with mud, and after removing the glue I discovered an awful white glue.

I tried to dissolve the glue by leaving the fossil in acetone for a whole day, then I left the it in alcohol for another whole day, and nothing happened.

I finally soaked it in hot water but another time nothing happened.

Does anyone know how to remove it?

 

 

Thanks!

[Ludwigia]

21 minutes ago, Nipponites said:

I tried to dissolve the glue by leaving the fossil in acetone for a whole day, then I left the it in alcohol for another whole day, and nothing happened.

I finally soaked it in hot water but another time nothing happened.

Does anyone know how to remove it?

 

If all that didn't work, then I wouldn't try any more chemicals, since the calcitic fossil would probably end up getting corroded. I think you're gonna have to do it mechanically and then fill in and color the occurring crevices. There also appears to be something very wrong with the cephalon.

[Nipponites]

The glue is very hard to remove, and I have two more, so I will leave it as is.

Thank you very much.

[Ptychodus04]

you could try softening the glue with a dab of acetone. Don't soak it, or your trilobites might fall apart. Just dab it on with a cotton swab. This might soften it enough to mechanically remove the extra glue enough to fill the gaps.

[Harry Pristis]

One option you didn't exercise is heat.  Common, polymerized polyvinyl acetate (white glue) will soften when heated, and may be picked away with a needle or a dental pick, or excised with an X-Acto knife or scalpel.

[oilshale]

 

Strange, I actually know very few adhesives that are not dissolved or at least softened by acetone. 
I can only think of strongly cross-linked reaction adhesives such as epoxies. 
I would try again with a non-polar solvent like gasoline or xylene (cellulose thinner). Probably won't work either.