Hi,

I'm going to be a dental student this fall and I just got a bunch of
extracted teeth from my local dentist.  When he gave them to me, they were in
a water/bleach solution and though they weren't in the best shape, they
looked relatively ok.  

the problem now is this:  i transferred the teeth to my own mason jar i have
at home and i put a 1:3 (bleach:water) solution (this was recommended by the
dentist i work for).  the next day, the solution was all BLACK and most of
the teeth were BLACKENED too!! i tried to scrape the black residue off, but
it won't come off easily.  Most of the black parts are the roots of the teeth.
I have no idea what is going on and why they would all of a sudden turn black
now, but it just seems like a waste that all these teeth can't be used now
for practice.  any suggestions or explanations?  

thanks!