Black black is a japanese chewing gum famous due to one of its ingredients caffeine these sticks of gum mentioned in wired magazine are charcoal grey in colour and have an amazingly strong mint flavour in japan due to their caffeine power notorious hard men advertise them they contain sugar oolong tea extract ginko entract chrysanthemum flower extract grape extract vitamin b 3 and that all important caffeine as their english label says hi technical excellent taste and flavor