Colour:  Ultramarine Blue (Bleu Outremer)
Details: Dry Ground Pigment
Technical characteristics : 
Chemical name : polysulfurized sodium aluminosilicate
Color index : B29
Case number : 101357-30-6
Apparent density : 648 g/l
UV resistance : average (generally, blue pigment have poor outdoor performance)
Coloring power : very good
 
Use : lime, wax, paint, plaster, fresco, glaze, cement, fine arts.
This pigment is in powder. For use in artistic paint, it should be finely ground in a mortar before mixing it with the binder.
Linseed oil : dilute the powder in some turpentine oil before adding it to linseed oil.
Paint with water/lime paste : dilute the pigment in some water to make it liquid before incorporating it into the paint.
Lime powder/cement/plaster : directly incorporate the pigment (up to 10% based on the weight of the binder), then mix in order to stain all of your binder.
Color : warm and deep blue, pulling toward purple with a transparent binder. Lighter with a white binder, the purple trend is accentuated. 
This pigment is 100% synthetic without any danger for health or the environment.
Made in England.
History : Overseas blue was formerly obtained by grinding lapis lazuli, a fine stone resulting from volcanic fusion from Afghanistan. It is found in China, Tibet but also in Egypt during Antiquity. In the Middle Ages, it was used for illuminations. In the Renaissance, this pigment was so expensive that the artists ask directly to their patrons to pay it ! It was replaced by a synthetic pigment in the nineteenth century. At that time, 6000 francs of reward were promised to the person who would discover the way to manufacture ultramarine blue synthetically. It is the industrialist Jean-Baptiste Guimet, from Lyon, who receives the award in 1828. The reputation of the Guimet blue becomes worldwide by its use in paints and for the bluing of paper and linen.