Cobalt aluminate. In the 19th century, the French chemist Thénard successfully obtained this pigment from a natural mineral. A very pure blue shade. Excellent lightfastness, very stable in mixtures. Suitable for all technique
Ferric ferrocyanide. Discovered in Prussia at the beginning of the 18th century. Difficult to grind and moisten. Very high tinting strength. Good lightfastness (contrary to its reputation) except...
