French beekeepers in Ribeauville abuzz over blue honey
5 October 2012 Last updated at 06:31 GMT
Beekeepers in northeastern France have been alarmed to find their bees producing honey in unnatural shades of green and blue.
The beekeepers believe the source of the problem is a biogas plant close to Ribeauville in Alsace.
It is thought the bees have been eating the sugary waste from M&Ms, small chocolates in brightly-coloured shells.
The plant operator said it regretted the situation and had put in place a procedure to stop it happening again.
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