3.1.7. Black

The IRFC photography determined that the black paints were very often mixtures of black with other pigments. The SEM-EDS and PLM analyses revealed that bone black is prevalent only in black brushstrokes of *Autumn colours* (sample 9). The intense black found in other paintings resulted entirely from mixing carbon blacks with ultramarine, Prussian blue, cobalt blue, and viridian. In *Village scene* (sample 13, 14) and *Landscape in Switzerland* (sample 18), it is evident that the role of the black pigment is taken by ultramarine.
