Laurie Reilly in Queensland Australia notes:

>>We recycle our waste paraffin wax from the drip tray under the embedding 
centre etc. to make cutting boards. About 1.5L of wax is melted down in the 
oven, poured into a plastic tray (40cm x 28cm) and allowed to solidify. The 
tray is then turned over and flexed and the wax cutting board tipped out.
The wax is very gentle on cutting instruments and when it gets too dirty it 
can be discarded.<<

I did this in the old days of plain paraffin wax. I'd been wondering if it 
still worked with modern embedding media.

Bob Richmond
Samurai Pathologist
Knoxville TN