Simulated reflection spectra of copper red glaze and gold ruby-pink enamel Gen Li, Cui Jia, Baoqiang Kang, He Li and Yong Lei Eur. Phys. J. Plus, 140 5 (2025) 368 Published online: 07 May 2025 DOI: 10.1140/epjp/s13360-025-06287-z