The propolis collecter I once saw was like a queen exluder with much
smaller mesh (I think it was just window screen).  This device was
placed over the top super of a full hive.  The bees filled the mesh
with propolis which was harvested by placing the collecter in the deep-
freeze.  When frozen, the propolis was easily cracked off the mesh.
 
Cheers,
Dave Pehling
 
 
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