Ans: Mercurochrome had been widely used as an antiseptic across the world until its production for normal use was halted by a number of nations in the 2000s owing to the risk of mercury poisoning because of the presence of mercury as its primary content. Apart from that, it is also known for its staining properties and is used in biological experiments to stain and mark tissue margins which can be later observed as distinctive carmine red colour. It is also used as a metal dye in industrial applications to identify metal cracks.