turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbedsolution a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride
lamp consisting of a tube coated on the inside with a fluorescent material; mercury vapour in the tube emits ultraviolet radiation that is converted to visible radiation by the fluorescent material