Michael Harding Cobalt Blue - Introduced at about the same time as Ultramarine, Cobalt Aluminate is a synthetic inorganic pigment. It is a more greenish-blue, with a heavier, more mineral appearance when seen as dry pigment. The hues formed from it are correspondingly heavier and more grey. But it has a certain shade that the less expensive ultramarine cannot quite match. The paint film when cured is quite soft.
Color Index | PB28 |
Drying Speed | Very Fast |
Transparency | Semi-Transparent |
Lightfastness | Excellent |
Oil Content | Average |
Tint Power | Average |
Toxicity | Non-Toxic |
ASTM D-4236 | ✓ |
Prop 65 | ✓ |