Beekeepers in Ribeauville, France discovered blue honey in their hives. When they investigated further, they discovered that their bees were harvesting M&Ms manufacturing waste from a biogas plant that processes the industrial runoff from a Mars chocolate factory. The blue honey will not be offered for sale. From the BBC:
The plant operator said it regretted the situation and had put in place a procedure to stop it happening again.
"We discovered the problem at the same time [the beekeepers] did. We quickly put in place a procedure to stop it," Philippe Meinrad, a spokesman from Agrivalor, the company operating the biogas plant, was quoted by Reuters as saying.
The company, which deals with waste from a Mars chocolate factory, said it would clean out the containers, store all incoming waste in airtight containers and process it promptly, according to a company statement published in Le Monde newspaper.