Over-Hardened Tissues


I am a histology student, and would like help with a problem we are having.  
Tissue is turning out overly hard and we are having difficulty in sectioning 
it.  The tissue has been fixed in formalin, and run on a routine overnight 
processor with a closed system.  The tissue is Paraplast embedded, and cut on 
a rotary microtome.  Any suggestions to either prevent or deal with the hard 

Thanks in advance!!

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