All our photoluminescent pigments are based on strontium aluminate, they are non-toxic,harmless and non-radioactive. Compared to the traditional Zinc Sulfide photoluminescent pigments, the luminosity strontiumaluminate pigments is at least 10 times as higher as it and the afterglow time is also at least 10 times as longer as it. Our photoluminescent pigments can be added into many different transparent medium, such as ink, paint, plastic, cer amic, glass, etc.