Cobalt blue | ||
---|---|---|
— Color coordinates — | ||
Hex triplet | #0047AB | |
RGBB | (r, g, b) | (0, 71, 171) |
HSV | (h, s, v) | (215°, 100%, 67%) |
Source | BF2S Color Guide | |
B: Normalized to [0–255] (byte) | ||
Cobalt blue is a cool, slightly desaturated blue color, historically made using cobalt salts. It was discovered by Louis-Jacques Thenard in 1802[citation needed]. The world leading manufacturer of cobalt blue in the 19th century was Blaafarveværket in Norway, led by Benjamin Wegner. It is extraordinarily stable. Chemically it is a cobalt(II) oxide-aluminium oxide, or cobalt(II) aluminate, CoAl2O4. Commercial production began in France in 1807. It is made by sintering the stoichiometric mixture of finely ground CoO and Al2O3 at 1200°C.
The first recorded use of cobalt blue as a color name in English was in 1777. [1]
Cobalt blue in human culture[]
Art
- John Varley suggested cobalt blue as a good substitution for ultramarine blue for painting skies.
- Maxfield Parrish, famous partly for the intensity of his skyscapes, used cobalt blue, and cobalt blue is sometimes called Parrish blue as a result.
Video Games
- The Nintendo DS Lite is available in cobalt.
- Sonic the Hedgehog's color is officially cobalt.
Construction
- Because of its chemical stability in the presence of alkali, cobalt blue is used as a pigment in blue concrete.
Glassmaking
- The blue seen on many glassware pieces is cobalt blue, and it is used widely by artists in many other fields.
Ophthalmology
- "Cobalt Blue" is used as a filter used in ophthalmoscopes, and is used to illuminate the cornea of the eye following application of fluorescein dye which is used to detect corneal ulcers and scratches.
Toxicity[]
Cobalt blue is toxic when inhaled or ingested. Potters who fail to take adequate precautions when using cobalt blue may succumb to Cobalt Poisoning.
References[]
- ↑ Maerz and Paul A Dictionary of Color New York:1930 McGraw-Hill Page 91; Color Sample of Cobalt Blue: Page 131 Plate 34 Color Sample L7
See also[]
- List of colors
External links[]
- History of Cobalt blue. Pigments through the Ages. WebExhibits.
Shades of blue | |||||||||
---|---|---|---|---|---|---|---|---|---|
Air Force blue | Alice blue | Azure | Baby blue | Blue | Brandeis Blue | Carolina blue | Cerulean | Cerulean blue | Cobalt blue |
Columbia blue | Cornflower blue | Cougar blue | Dark blue | Denim | Dodger blue | Egyptian blue | Electric blue | Han purple | Indigo |
International Klein Blue | Light blue | Maya blue | Midnight blue | Navy blue | Periwinkle | Persian blue | Powder blue | Prussian blue | Royal blue |
Sapphire | Sky blue | Steel blue | Ultramarine | Yale blue | |||||
de:Thénards Blau fa:لاجوردی fr:Bleu de cobalt it:Cobalto (colore) nl:Kobaltblauw ja:コバルトブルー no:Koboltblå ru:Тенарова синь simple:Cobalt blue sv:Koboltblått vi:Cô ban (màu) zh:鈷藍色