... safety from the accident as the lamplights were off for the absence of power.It can be used in ... after recharged by sunlight, lamp light, UV light for a few minutes.Material: Strontium Aluminate based. Appearance: Yellowish crystal powder ... photoluminescent printing paper/ photopaper, photoluminescent film, photoluminescent shoelace / string, etc.For more information, please feel free to contact us.