Grades of Glow in the Dark Dye

This is also a very important area in selecting a glow in the dark pigments that will be most suited to your particular type of application. Firstly the grade or size of the individual glow in the dark particles are measured in uM or microns which you can think of as a mesh size or screen size. A low size of glow in the dark dye say 10-20um will not have the same strength and after glow of say 50-65um which in turn will be less than 100-150um however there are certain pro's and cons to each size and it's not a simple as just saying I will use the largest size for the best after glow.