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Rhodamine B polyethylene microspheres appear pink in the daylight and are supplied in dry powder form. Rhodamine B particles of smaller sizes (<~100um) show a weak orange fluorescent responses, with 10-27um being the weakest. Larger Particles have a slightly better fluorescent response.
Other colors, sizes and grades of fluorescent particles are available:Fluorescent Polymer Particles, Beads, Microspheres
Daylight Color: Pink
Illumination Color: Weak Orange response (Peak ~595nm)
Particles in Size Range: >90%
Spherical Particles: >90%Note: 710-850um size is >75% spherical particles
Polyethylene microspheres are hydrophobic and need to be coated with a surfactant prior to suspending in water. We recommend Tween 80 Bio-compatible Surfactant.
Material Safety Data Sheet - Polyethylene Spheres, Beads, Microspheres, and Nanospheres
Pink Cellulose Acetate Polymer Spheres - Large Plastic Beads ~1.3g/cc - 2.9mm
Pink Polyethylene Microspheres 1.00g/cc - 10um to 1000um (1.0mm)
Fluorescent Blue Polyethylene Microspheres 1.13g/cc - 27um to 425um