Styli Style Liquid Liner, Blackest Black 501, Really lasts 24+ hours! 24 HOUR POWER. Go dark, darker, darkest. Liquid Eyeliner 24 is the first ever US eyeliner pen to contain the newly approved carbon black powder. European women have been using for years to achieve that truly black eyeliner look. The semi-permanent waterproof formula lasts all day and dries super fast for easy application. The fine pen nib delivers super thin and wider lines for that more dramatic liquid eyeliner effect.