Kajal is an eye cosmetic composed of kohl stone, which is made out of a rock called galena, according to the National Center For Biotechnology Information. This rock is primarily composed of lead sulfide. The lead content makes it a dangerous type of eyeliner.
Although kajal eyeliner provides a therapeutic cooling effect to the eye, the high lead content may lead to the negative effect of unwanted lead storage. Applying a lead-laden product in close proximity to the fluid of the lower eyelids causes absorption of this unsafe product. Despite the scares of lead poisoning, kajal eyeliner is often used in India to ward off "the evil eye."