Cobalt blue
From Wikipedia, the free encyclopedia
| Cobalt blue | ||
|---|---|---|
 |
||
| Hex triplet | #0047AB | |
| B | (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 Thénard 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]
Contents |
[edit] Cobalt blue in human culture
- 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.
- The Nintendo DS Lite is available in cobalt.
- Sonic the Hedgehog's color is officially cobalt.
- Because of its chemical stability in the presence of alkali, cobalt blue is used as a pigment in blue concrete.
- The blue seen on many glassware pieces is cobalt blue, and it is used widely by artists in many other fields.
- "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.
- Cobalt blue is used by adidas for their standard shade of blue.
 An example of the hue of cobalt blue. |
 The color is due to cobalt ions in the glass. |
[edit] 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.
[edit] 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
[edit] See also
[edit] External links
- History of Cobalt blue. Pigments through the Ages. WebExhibits.
 |
This color-related article is a stub. You can help Wikipedia by expanding it. |
