Bees feeding on M&M's production waste (candy dyes) has been discovered to be the source of a contaminated honey crop from local beekeepers in the town of Ribeauville in the region of Alsace, France. It is good to understand how contamination from far and wide sources can affect "pure" foods and products.
http://www.huffingtonpost.com/2012/10/04/blue-green-honey_n_1938682.html