Back Kobalt (kleur) Afrikaans أزرق الكوبالت Arabic Azul cobaltu AST Blau de cobalt Catalan Тенарла кăвак CV Thénards Blau German Μπλε του κοβαλτίου Greek Kobalta bluo Esperanto Azul cobalto Spanish آبی کبالت Persian
| Cobalt blue | |
|---|---|
 A sample of a commercial cobalt blue pigment | |
 Color coordinates | |
| Hex triplet | #0047AB |
| sRGBB (r, g, b) | (0, 71, 171) |
| HSV (h, s, v) | (215°, 100%, 67%) |
| CIELChuv (L, C, h) | (33, 82, 259°) |
| Source | [Unsourced] |
| ISCC–NBS descriptor | Vivid blue |
| B: Normalized to [0–255] (byte) | |
| Identifiers | |
|---|---|
3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.100.107 |
| EC Number |
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PubChem CID
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| Properties | |
| Al2CoO4 | |
| Molar mass | 176.892 g·mol−1 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Cobalt blue is a blue pigment made by sintering cobalt(II) oxide with aluminium(III) oxide (alumina) at 1200 °C. Chemically, cobalt blue pigment is cobalt(II) oxide-aluminium oxide, or cobalt(II) aluminate, CoAl2O4. Cobalt blue is lighter and less intense than the (iron-cyanide based) pigment Prussian blue. It is extremely stable and historically has been used as a coloring agent in ceramics (especially Chinese porcelain), jewelry, and paint. Transparent glasses are tinted with the silica-based cobalt pigment "smalt".