... Glowing in dark at night, luminescent 2. Long time glowing, more than 15 hours 3. No harm, safe Night glow powderGlowing in ... printing ink, silkscreen ink, ceramic glaze. The photoluminescent pigment could also be used as additive for making of plastic molding ... materials Chemical property: a) Composition: alkaline earth aluminates b) Insoluble in water, alkalis ...