Beekeepers were mystified after the bees began producing the oddly-coloured honey in August, but have managed to identify the culprit as a nearby M&M's factory.
Metro reports that the a biogas plant two and a half miles away had been processing waste from the M&M's factory, which produces the red, blue, green, yellow and brown shells.
The beekeepers are failing to see the funny side of the multi-coloured honey. According to Alain Frieh, president of the apiculturists' (beekeepers) union, while the taste of the product is unaffected, it is "not sellable" as honey.
Honey sales have already been affected by high bee mortality rates and dwindling supplies after a tough winter.
France is one of the biggest exporters of honey in Europe, producing around 18,330 tonnes annually.