Try formalin/formic acid combination, these are commercially available from
several sources.  The formic acid is approx 10% (MSDS info I have but could
vary with manufacturer).  These solutions work quite well on small bone or
calcified tissues.  Richard Allan, Decal Corp, Shandon, Surgipath, some
available through Fisher, etc.


Gayle Callis
Veterinary Molecular Biology
Montana State University
Bozeman MT 59717-3610
406 994-4705
406 994-4303