... light for 5-30mins which can be glow in the dark 12hours more. this absorb and emit light process is ... repeatedly.Non-toxin, harmless , non-radiation, eco-friendly, easy useGlow color: green, sky blue,aqua bluenon adhesive Specification: A4, A3, A2 ... sign/ photoluminescent safety sign/ photoluminescent vinyl film/ glow in the dark ink jet photo paper/ luminescent PVC film/ photoluminescent rigid sheet ...