... , no heavy metalsusages of superlong afterglow luminous pigment:suitable for various transparent and semitransparent medium, such as plastic, ceramic ... glow in the darka. indication positioncan be applied in switch, control board, plug, lock, electric torch, stairway, ... , clothes, shoes, working uniform, etc. superlong afterglow luminous pigment/photoluminescent water base powder/glow in dark water base ...