Mengyao Pan, Xiao bai Li, Chengjia Xiong, Xiaoyi Chen, Lebin Wang, Xi Chen, Lei Pan, Hongbo Xu, Jiupeng Zhao, and Yao Li. Robust and Flexible Colloidal Photonic Crystal Films with Bending Strain–Independent Structural Colors for Anticounterfeiting. Part. Part. Syst. Charact. 2020, 1900495.