There's one in my lab too.
I prefer to fight for cryostat sections on fixed material despite the 
trials.
Colleagues will appreciate that I am not from the H&S School of 
Safety Enforcers, but I always have a little concern about blasting 
unfixed tissue with CO2, even when using the more advanced 
containment accessories.
The fiddle of staining and, particularly, mounting free floating 
sections was always an occupation most frequently cursed by 
"Sod's Law"

Russ Allison, 
Dental School
Cardiff
Wales