Question.1 Is Photoluminescent Material harmful?
Answer.1 No, it is harmless.
Question.2 Why is it regarded as harmless?
Answer.2 Primitive Photoluminescent pigment used to include sulfide and radioactive elements but the existing one doesn't have them. Its safety has been confirmed through best method LD50 (by rat) and EN71-3 (safety certification for import goods to many countries including arsenic limitation).
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