Fig. 12From: An analytical survey of zinc white historical and modern artists’ materialsCathodoluminescence images (10x, ~ 390 µA, 11 kV; at the top) of: a Brüggemann indirect ZnO; b Brüggemann direct ZnO; c ZnO nanosmoke powders. The corresponding spectra are shown at the bottom of the FigureBack to article page