... Glow in dark pigment, glow in dark powder, 20~30um. Medium glow. Suitable for arts etc. Glow ... : Yellowish crystal powder.Average particle size range: 20~30um.Luminous color: Sky-blue.Free of dangerous, toxic, heavy metals, ... the dark pigments (glow in yellow-green, blue-green, sky-blue, blue-purple, red, orange, etc.)2. Glow ... Glow in dark powder, glow in dark pigment, sky-blue, 20~30um. Medium glow.