Blue honey in jar
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French beekeepers in Ribeauville abuzz over blue honey

5 October 2012 Last updated at 07:31 BST

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, as Catharina Moh reports.