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The luminescent board is researched and produced by ourselves with patent. It is a kind of hard plastic board, non-toxic, harmless and with no radioactivity. After absorbing visible light for 10 to 30 minutes, it can glow in the dark for 12 hours at least. It can be repeated at any time for storing and glowing process. It belongs to long after-glowing display board with excellent comprehensive advantages. It can be used for making safety signs or as indication in the public area and recreation ground.