In the light of the recent news that Coke and Pepsi are now altering their recipe to avoid getting a cancer warning label on themwe did some investigation ourselves to get to the base of it. Firstly as per the news it is unclear if the change will be applicable to India. They mention California and the US in all that we read. All colas use a caramel colouring which contains a chemical called 4-Methylimidazole. This is formed as a by-product of fermentation in foods. It is used in the manufacture of pharma drugs photography chemicals dyes and pigments etc.