http://www.cd-bioparticles.com/p/DiagNano™-Green-Fluorescent-Amine-Silica-Particles-20-μm_258_262_293_3959.html20 µm fluorescent silica particles with amino groups (NH2) on the surface. Fluorescence dyes are covalently bound in the silica matrix and availbale withgreen fluorescence (excitation: 485 nm, emission: 510 nm).