Ultramarine Blue (Red Shade) Pigment
Ultramarine Blue (Red Shade) is a synthetic inorganic blue pigment consisting of a double silicate of aluminum and sodium with sulfide and occurs in nature as a component of the semi-precious stone, lapis lazuli.
Ultramarine Blue is a synthetic inorganic blue pigment consisting of a double silicate of aluminum and sodium with sulfide and occurs in nature as a component of the semi-precious stone lapis lazuli.
Ultramarine Blue (Red Shade)
|Common Names (rock):
English: ultramarine blue
French: bleu outremer
Italian: blu oltremare
Spanish: azul ultramarino
|azure blue, azzurrum ultramarine, azzurrum transmarinum, azzuro oltramarino, azur d'Acre, Lazurstein, pierre d'azur
Origin and History
In 1814, Tassaert observed the spontaneous formation of a blue compound, very similar to ultramarine, if not identical to it, in a lime kiln at St. Gobain, which caused the Societé pour l'Encouragement d'Industrie to offer, in 1824, a prize for the artificial production of the color. Processes to make the artificial pigment were devised by Jean Baptiste Guimet (1826) and by Christian Gmelin (1828); but while Guimet kept his process a secret, Gmelin published his and thus became the founder of the "artificial ultramarine" industry.
Ultramarine is a blue pigment consisting of a double silicate of aluminum and sodium with sulfide, occurring in nature as a component of lapis lazuli. The Colour Index designation is Pigment Blue 29, and the Colour Index number is 77007. Ultramarine is one of the most complex mineral pigments, a sulfur-containing compound of sodium-silicate, essentially a mineralized limestone containing a blue cubic mineral called lazurite (the major component of lapis lazuli). The term ultramarine designates both the natural mineral and the artificial pigment, although today, most distinguish the natural mineral by its name, lazurite, or the rock containing it, lapis lazuli.
Permanence and Compatibility
Ultramarine is a synthetic blue pigment rated by the American Society of Testing and Materials (ASTM International) as lightfastness category I, which is the highest lightfastness. It is compatible with all pigments but is sensitive to acids, so avoid using it with acidic mediums and supports.
Oil Absorption and Grinding
Ultramarine blue absorbs a medium amount of oil (38 to 42 grams per 100 grams of pigment), which may slow the drying of oil paint and hence is a moderate-drying oil color. It is a highly refractive pigment and is difficult to grind in oil, although it easily disperses in water.
Ultramarine blue is not considered toxic, but care should be taken in handling the pigment.
|Pigment Blue 29 (77007)
|Sodium Calcium Aluminum Silicate Sulfate
|(Na, Ca)8Al6Si6O24(S, SO4)
|Particle Size (mean):
|38–42 grams oil / 100 grams pigment
|Health and Safety
|No acute or known chronic health hazards are associated with this product's anticipated use (most chemicals are not thoroughly tested for chronic toxicity). Protect yourself against potentially unknown chronic hazards of this and other chemical products by keeping them out of your body. Do this by avoiding ingestion, excessive skin contact, and inhaling spraying mists, sanding dust, and vapors from heating. Conforms to ASTM D-4236.
For a detailed explanation of the terms in the table above, please visit Composition and Permanence.
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