Is this related?
Coke and Pepsi alter recipe to avoid cancer warning
"Coca-Cola and Pepsi are changing the recipes for their drinks to avoid being legally obliged to put a cancer warning label on the bottle.
The new recipe for caramel colouring in the drinks has less 4-methylimidazole (4-MEI) - a chemical which California has added to its list of carcinogens.
The change to the recipe has already been introduced in California but will be rolled out across the US.
Coca-Cola says there is no health risk to justify the change." BBC 9 March 2012
Ian