Key Parameters in the Production of Medieval Luster Colors and Shines

Lusters of different color and reflectivity were obtained under controlled conditions in a laboratory using medieval recipes. In this study, we analyze the influence of paint recipes, glaze compositions, and thermal paths and atmospheres on the final aspect and characteristics of the Ag/Cu nanocomposite layer formed. The colors and reflectivity of the medieval lusters were successfully reproduced using the cinnabar‐containing recipes as basic luster paints. X‐ray diffraction, Optical UV‐Vis spectra, and microprobe chemical analysis were carried out to determine the composition and the nature and size of the nanoparticles and their relationship with their optical properties.