cobalt blue
Sign in to saveAlso known as Parrish blue, cobalt, azure cobalt, olympia blue, Thénard's blue, Hungary blue, Vienna ultramarine, Vienna blue
color
Key facts
- Hex triplet
- # 0047AB
- Srgb r g b
- (0, 71, 171)
- Hsv h s v
- (215°, 100%, 67%)
- Cielch uv l c h
- (33, 82, 259°)
- Iscc nbs descriptor
- Vivid blue
via Wikipedia infobox
~5 min read
Encyclopedic overview
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 has historically 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".
Historical uses and production
Excerpted from Wikipedia’s “cobalt blue” article, available under the CC BY-SA 4.0 licence.