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We report the evaluation of chiral nematic liquid crystal (CNLC) in blocking ultraviolet (UV). The CNLC was coated on a calcium fluoride substrate to measure the spectral transmittance, which was measured to detect the UV‐blocking effect of CNLC. The results show that CNLC could reduce UVB (290–320 nm) by 99.9% and UVA (320–400 nm) by 95.6%. The barrier effect of cake‐shaped semi‐solidified CNLC microspheres...