Authorities in Corsica have launched an investigation into a producer of “naturally” blue wine after a study published earlier this year found an “unusually high” quantity of an artificial blue dye in the product.

As the blue wine trend gathers pace, with new blue wine Vindigo going on sale in France this month, French experts are finding the phenomenon hard to swallow.

French entrepreneur René Le Bail is on a mission to turn his fellow countrymen into a nation of red, white and blue wine drinkers with the launch of ‘Vindigo’.