Since August, beekeepers around the town of Ribeauville in the region of Alsace have seen bees returning to their hives carrying unidentified colorful substances that have turned their honey unnatural shades - and they think it's because an M&M’s are being manufactured nearby.
http://www.nydailynews.com/news/world/french-bees-making-colored-honey-article-1.1175991


There’s a Mars plant about 60 miles away, but even closer is the biogas plant which has been handling the candy waste.
http://consumerist.com/2012/10/05/blue-green-honey-might-look-pretty-but-beekeepers-are-miffed-at-mm-related-coloring/