[Histonet] Decalcifier, adding Zinc Fixative

[M.O.]

Hello Histonet!  Would anyone know if it is okay to add zinc fixative to
TBD-2 decalcifier?  What ratio would be okay?

I am having an issue with human bone samples and want to make sure that
these bones are properly fixed.  They are about 7mm thick and I am fixing
them for 4 days, but additional fixation in the TBD-2 would be best.

Thank you,
Merissa