>
>
> >I remember reading something in detail about the criteria for choice of
> propolis sources, but I can't figure out where. It had to do with the
> physical properties of the substances, more than the phytochemical
> properties (which may be incidental, though fortuitous).


Some years ago I published photos of bees collecting the caulking used on
motor homes.  But they only collected certain brands of caulking in the
parks.  I don't know whether the cue was odor or texture, but sure suspect
odor.
-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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