Nature CommunicationsDual-responsive coloration of Janus droplets via total internal reflection and interference applied as single-use freezing indicatorsYinhan XuMeirong TianMengmeng ZhangDengwen HuGuoqiang HanJintao ZhuJiangping XuShin-Hyun Kim2026-02-27Full textDOI https://doi.org/10.1038/s41467-026-70055-5