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DiagPoly™ Black Coloured, Carboxyl Polystyrene Particles, 0.4 μm (# DDCBL-E006) are carboxylated polystyrene particles with black dyes encapsulated for colour visualization. The dyed particles are available to support covalent immobilization of biomolecules with carboxyl-functionalized surfaces and used in lateral chromatographic experiments and latex agglutination tests. The density of coloured liquid suspension is 1.05 g/mL. Refractive Index: 1.59@589nm (25°C) https://www.cd-bioparticles.com/product/diagpoly-black-coloured-carboxyl-polystyrene-particles-0-4-m-item-ddcbl-e006-1130.html