- FF beads are magnetically separable fluorescent beads, incorporating a fluorescent dye into conventional FG beads.
- FS beads are nonmagnetic fluorescent beads.
- Europium is used as a fluorescent dye (Ex: 346 nm / Em: 616 nm)
http://www.nacalaiusa.com/products/view/320/fluorescent-beads-with-magnetic-and-non-magnetic-particles