CD Bioparticles provide a wide range of uniform and monodisperse colored polystyrene particles. Our colored particles are prepared by polymerizing styrene in oil soluble dye solution in styrene. Therefore, the particles do not contain the solvents commonly found in the preparation of particles by staining with dye solutions in organic solvents. Diagpoly™ Colored Polystyrene Particles are intensely colored, which can enhance the visual detection in assays such as latex agglutination, dipstick, and membrane-based assays.