Researchers Recolor Polyester Using CO2

Researchers at the University of Fukui developed a method using supercritical carbon dioxide to redistribute dyes in polyester fibers, creating uniform colors without removing them. The study, published in The Journal of Supercritical Fluids in 2026, achieved identical green shades after 90 minutes and reduced root mean square error from 0.4388 to 0.1720 at 410 nm.