Highly Durable and Uniform Structural Coloration via Spray‐Coated Organic Mie Resonators Randomly Distributed in Three Dimensions

ABSTRACT Traditional nanoparticle‐based structural colors are hindered by poor color uniformity, limited durability, and fabrication processes that cannot easily be scaled, restricting their practical applications. In the present study, a spray‐coated Mie paint for highly uniform and durable noniridescent structural coloration is demonstrated. Polystyrene nanoparticles (PSNPs) are employed as Mie resonators and embedded in a sodium silicate matrix with a carbon black (CB) additive. The sodium silicate immobilizes the PSNPs in a disordered structure that prevents self‐assembly, while the CB suppresses multiple scattering, ensuring that the coloration is governed by backscattering from PSNPs. Because structure factors have no effect, variation in the reflectance of less than 1.2% and a CIEDE2000 color difference ( ΔE 00 ) of less than 0.26 are achieved, indicating excellent color uniformity. The Mie paint withstands the hardest 6H pencil, and its ΔE 00 remains below the acceptability threshold after abrasion, UV irradiation, and solvent immersion testing, indicating a negligible change in color. Thus, the proposed Mie paint offers uniformity, durability, and scalability, qualities that have often been lacking for both traditional photonic structures and commercial paints. Our strategy thus lays the groundwork for the development of sustainable, high‐performance color coatings.