Cobalt Blue is a cool blue able to function as the only blue in the artists paint box if need be. It is more opaque than Ultramarine which gives it excellent covering power. Its bright color is a good workhorse for making a wide range of blue, green, and violet colors. For the landscape artist it is generally a better blue for making sky colors than Ultramarine Blue. Try mixing it with Australian Sky Blue to get the deep intense sky colors of mid summer. Mixed with Cerulean Blue as well as the Australian Sky Blue gives slightly greener blues that are more characteristic of winter or coastal sky. Mixed with Australian Ghost Gum gives the softer, more subdued blues suitable for everything from smoke from campfire to misty mornings.
Chemical Description: Oxides of cobalt & chromium
Pigment Numbers: PB28
Lightfastness Rating: ASTM I
Pigment Opacity: Opaque
Paint Opacity: Opaque