Blacklight bulbs are special light sources that emit ultraviolet (UV) light, which is invisible to the human eye. They are commonly used in various applications, such as creating glowing effects in art, enhancing the visibility of certain materials, and in nightclubs for special lighting effects. These bulbs come in different forms, including fluorescent tubes and compact fluorescent bulbs. When exposed to blacklight, certain substances, like fluorescent dyes and white clothing, can emit visible light, creating a striking visual contrast. Blacklight bulbs are also used in forensics to detect bodily fluids and other substances.