"Glow in the dark hair" refers to hair that has been treated with a chemical or pigment that causes it to emit a visible glow when exposed to ultraviolet (UV) light or other forms of electromagnetic radiation. This effect is often achieved through the use of phosphorescent or fluorescent substances, which absorb energy from the light source and then release it slowly as visible light, creating a glowing appearance.
Glow in the dark hair has become increasingly popular in recent years as a way to express personal style and creativity. It is often used for special occasions, such as parties, concerts, and festivals, but it can also be worn as a more permanent fashion statement. In addition to its aesthetic appeal, glow in the dark hair can also serve a practical purpose, as it can help to improve visibility in low-light conditions.