any soft drink plants in the area? A bottler near where I used to stay got caught dumping out expired flavourant packs when honey in the area started turning red.
Yep, same happened near me before. Local beekeepers got some real dark colored rootbeer honey.
I seem to recall another story about colored honey (blue?) where the bees had been feeding on antifreeze - not recommended for eating.
A bit of digging, and it turns out there's a Coca-cola bottler in Aberdeen, the same area as Dees Bees Apiary. I'm willing to bet that purple honey coincides with grape Fanta spills or dumps