Ted Fischer wondered about:
 
> ... a strikingly bright yellow (which) might be derived from purple
> loosestrife ....
 
My experience with p. loosestrife honey is that is one of the most
easily recognizable varietal honeys anywhere.  It has a darkish green
hue, very much like a straight 30 weight motor oil.  The p. loosestrife
honey in these parts would never be described as "a strikingly bright
yellow".
 
The flavor description (OK at first, but with a somewhat bitter after
taste) agrees with what some have described for p. loosestrife, but I
have always found p.l. to be a rather plesant tasting honey.
 
I can't speak to soybeans as a source for the bright yellow honey,
but you can definitely rule out loosestrife.
 
Aaron Morris - I think, therefore I bee!