Cobalt Green Deep is a rich and dark opaque green. It can be used to create depth with lighter greens, and also looks excellent in mixes.; Sennelier gathers only the finest organic and inorganic pigments from around the world. These pure pigments are ground very slowly with extreme care to an extra-fine consistency. They are then combined at maximum concentration with an archival safflower oil to yield the highest possible tinting strength and a rich satin finish. This paint has a unique buttery texture.