This glow-in-dark powder is widely used for printing ink, printing paste and plastic part. The glow in dark powder is used for printing ink, printing paste , and plastic injection etc.It have short effection 1-2 hours, 30um size, andLong effection 6-12 hours, 38um.It have yellow green color, red, blue, orange etc. Glow-in-dark powder, lumious pigment powder