Glow powder can be automatically glow material in the dark, the main component is rare earth, belongs to the inorganic materials. glow powder first absorb all kinds of light and heat, converted into light energy storage, and then in the dark automatically glow, by absorbing all kinds of visible light to achieve the glow function, and can be used for an unlimited number of cycles, especially for 450 nanometers below the short-wave visible light, sunlight and ultraviolet light (UV light) has a very strong absorption capacity.