Corrigendum to "An 'imperial radiation': Experimental and theoretical investigations of the photoinduced luminescence properties of 6, 6′-dibromoindigo (Tyrian purple)" [Dyes and Pigments 160 (2019) 879–889]. (July 2019) - Verri, Giovanni; Martin de Fonjaudran, Charlotte; Acocella, Angela; Accorsi, Gianluca; Comelli, Daniela; D'Andrea, Cosimo; Nevin, Austin; Zerbetto, Francesco; Saunders, David