Canna-inspired superhydrophobic and icephobic regenerated cellulose based hierarchical intelligent colorimetric sensing film for food real-time visual monitoring

•Canna-inspired film is prepared by roll-to-roll and evaporation-induced self-assembly.•The first time bestowed with icephobicity to food freshness colorimetric sensing film.•The color changes are perceivable by inexpert and untrained users.•The film can apply for real-time visual monitoring of food freshness.