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Comparison of LC Bead and Radiopaque LC Bead (RO Bead) dye attachment. Acrylamido polyvinyl alcohol-co-acrylamido-2-methylpropane sulfonate hydrogel (PVA-AMPS) beads are reacted with Reactive Blue 4 (RB4) to make LC Bead visible (blue) to the user. RB4 is substituted with a triiodobenzyl moiety via a linker (L) for RO Beads which imparts a slight yellow color and importantly renders them visible on X-ray.
