Fluorescent microspheres are a mainstay in diagnostics and life sciences research, finding use as fluorescent markers, assay substrates, and instrument standards. In order to meet the unique performance criteria required of microparticles in these different applications we stock an extensive inventory of fluorescent microspheres and offer custom dyeing services. Bangs europium products offer extremely bright fluorescence and exceptional stability, in addition to well functionalized carboxylated surfaces for the covalent attachment of ligand.: