... by sunlight or lamp light, even UV light source for minutes.Material: Strontium Aluminate based.Appearance: Yellowish crystal powder ... toxic, heavy metals, radiation. Friendly to human and environment.Application: For brush paint, thermoplastic signs, arts, toys, etc.Dosage range: ... including plastic, rubber, paint, fiber, glass, resin, wax, ink, etc. to make the finished products glow in the dark ...