JAKE SALTZMAN, NEWS EDITOR [email protected]LUXEMBOURG, Sept. 3, 2020 — By coating droplets of an aqueous solution of hydroxpropyl cellulose with silica nanoparticles, and placing these “liquid marbles” inside an organic solvent, scientists have successfully made and displayed structural colors from cellulose-based polymers. Liquid marbles, which are millimeter-size droplets of liquid crystalline solutions, serve as a surrounding fluid in the system, and are coated to prevent them from mixing with the solvent. 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