The reason it is called “Dyed colors” is, they are mixed by natural colors (Yellow-Green, Blue-Green, Sky-Blue) with fluorescent dyes. Their afterglow time is around 4-6 hours in totally dark environment. They are often used in coating, printing, painting for decorations of buildings, clothes, drawings, housewares etc.

The mixture is just physically. If you have a special requirement of colors, you can also modulate your own.