Description
Cobalt Blue
![506-Cobalt-Blue](http://www.michaelharding.co.uk/wp-content/uploads/2015/11/506-Cobalt-Blue.jpg)
??Inorganic
Colour Index | PB 28 |
Drying Speed | Very Fast |
Opacity Covering and Tint Power | Semi-Opaque |
Lightfastness | Excellent |
Oil Content | Average, Linseed |
Toxic | No |
Conforms To | ASTM D-4236 |
??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 greyer. But it has a certain shade which the less expensive ultramarine cannot quite match. The paint film when cured is quite soft.