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freeing fossils from matrix

Does anyone out there know a safe way to release fossils from the limestone
matrix holding them?
I have tried hydrocloric and acetic acid, but in both cases the fossils
dissolve as well as the limestone, and that's very frustrating.  These
fossils are from the deposits in north Arkansas, and the limestone is extra
hard.  Most attempts at chipping the rock away results in explosive
There are several nice specimens, but they're locked up 'til I  can figure
out a way to free them.

Tahnx :-)  
Roger A. Stephenson (lightwaves)
Morrilton, AR 72110