Bobbi Brown 24 Hour Waterproof Kajal Eyeliner. Black. An intense, richly pigmented black eyeliner that gives intense definition to the lashes and lasts all day and night. Create dramatic eye looks with our easy-to-use creamy pencil that holds color for 24 hours. The formula is tested by ophthalmologists and is safe to apply to the wet edge. Apply along the lash line or the wet edge to the entire eyelid with short, even strokes. Extend in the outer corner for a winged look.