Thank you all who advice me how to make sections from old paraffin blocks! As you taught, I re-embedded the sample by melting down the paraffin,xylene, EtOH,Xylene,paraffin, then embedding. Finally when I tested it on microtome, beautiful sections are produced! After that I sealed the samples with paraffin.
 
Thank you very much! And thanks to histonet, I learned a lot here.
 
Wendy

		
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