The photoluminescent gravel produced by Realglow is a novel environmentally friendly material, non-toxic, harmless and non-radiation.Spread by hand, spread to concrete or epoxy surfaces, similar to spreading colored flakes and recycled glass, or directly mixed into the plaster and covering mixture.This kind of gravel can glow in the dark for more than 10 hours and only needs to absorb visible light for 5-30 minutes. This process of luminescence and absorption of light is repeated.