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Luminous paste main raw material is a photo-storage luminous powder, luminous powder is light-induced energy storage phosphor after by natural light, fluorescent light, ultraviolet light irradiation, the energy stored in the stop light irradiation, in order to slow fluorescence mode is released, so at night or dark place, can still see the light, it lasted for several hours to ten hours. So try sticking it absorbs light, do not have something cover. To light after the luminous, the longer the time to absorb the more light