Granulation is a property of some pigments which refers to pigments in the paint combining together in small groups once applied. This produces a flocculated or curdled effect that brings life to the colour surface.
Granulation is a typical property of ultramarine pigment in general, with a certain type of ultramarine pigment possessing this property more strongly than others. This type is usually given the name "French ultramarine" and is used when the specific granulation effect is required.
Other typical examples of granulating colours are Iron Oxide black, Cobalt green, Cobalt blue and Cerulean blue, Sienna natural, Ivory black, Terre verte and Emerald green.
Van Gogh watercolour 373 Dusk Pink
The Dusk series consists of vibrant water colours with a granulating undertone that adds a special texture to your artworks.