glow in the dark Ceramics tile is made of photoluminescent pigment Ceramic glaze. This Ceramic tile can glow in the dark more than 24hours after absorb the visible lights for 5-30mins.Non-toxin, harmless, non-radiation, eco-friendlyColor: green, blue, aquaSize: 50 x 200mm, 100 x 100mm, 200 x 200mm,...