French beekeepers were recently shocked when their bees started producing thick, blue and green honey.
After investigating, they discovered their bees were feeding on the colourful shells of M&Ms — a Mars processing plant was located just 4 km away.
The Mars waste-processing plant has now solved the problem and are cleaning any outdoor or uncovered containers that M&M waste was stored in, so it’s unlikely you’ll see the blue honey on the market any time soon.

As Reuters reports, the unsellable honey is a new issue for the beekeepers, who are already struggling with high bee mortality rates and dwindling honey supplies.
From http://sciencealert.com.au/news/20142405-25561.html