[Histonet] Formalin fixation - how long does it last?

[James S.]

I have been given some small mouse bones which were fixed in 10%
formalin for 48h but were then transferred to EDTA for decalcification.
They have been left in the EDTA for about 6 weeks. Will they still be
fixed or should I put them back into formalin - or is it too late to do
anything with them? Ideally we want to stain for B cells but could just
do some H&E if we cant get any staining.

Thanks
Sonya