 The U.S. version of Coca-Cola Blak replaced sugar with high fructose corn syrup, aspartame, and acesulfame potassium.Consumer Reports taste-testers found the French version to be less sweet and to contain more coffee flavor.The American and Canadian versions had a plastic resealable cap on a glass bottle that resembled the classic Coke bottle, where the French/Czech version was a bottle shape formed in aluminum.