Structural Color of Partially Deacetylated Chitin Nanowhisker Film Inspired by Jewel Beetle

Researchers have developed a film using partially deacetylated chitin nanowhiskers derived from crab shells, which are a food waste product. These nanowhiskers self-assemble into a multilayered structure that manipulates light to produce vibrant structural colors, such as green and purple stripes. The film's color stability depends on maintaining low ionic strength to prevent increased viscosity and color fading. Due to its environmental sensitivity and biocompatibility, this material is suitable for applications like food sensors to indicate freshness and as a sustainable, non-toxic alternative to traditional dyes in cosmetics.