Why is it inadvisable to look directly into a black light?

Looking directly into a black light is inadvisable primarily due to the potential for permanent eye damage. Black lights emit ultraviolet (UV) radiation, which is not safe to look at directly. Prolonged or intense exposure to UV light can harm the retina and other parts of the eye, leading to long-term damage. While temporary visual impairment might occur, the risk of irreversible injury is a far greater concern. This highlights the importance of using appropriate precautions, such as protective eyewear designed for UV light, to safeguard one's vision while performing tasks that involve black lights.

While other options mention various risks or legal aspects, they do not encompass the full extent of the health hazards associated with looking directly into a black light.