Different but related:
 
Some years ago, there was the story around that 'The bees don't like the
black plastic queen cells' (plastic queen cells for grafting into).  Me, I
immediately thought "Huh, how could they know in the dark?"
 
But it turned out to be true, but not because of the colour.  Seems a batch
of the cells had been moulded using a different release agent (?) in the
moulds, and it was enough subtle smell difference to make them unacceptable...
 
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Nick Wallingford, President
National Beekeepers Assn of NZ
email:  [log in to unmask]
NZ Beekeeping:  www.internode.net/~allend/nz/profile.html
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