Structure–Optical Properties Relationships in Cobalt-Based Purple Pigments Used by Robert Delaunay - Victor Gonzalez; Gilles Wallez; Didier Gourier; Camille De Caro; Steven De Meyer; Iryn Bijker; Koen Janssens; Mathieu Thoury; Francesca Gabrieli; Letizia Monico; Sara Carboni Marri; Catherine Dejoie; et al. (Journal of the American Chemical Society, 2025)