Art Spectrum® Dry Ground Pigment Cobalt Blue.
Cobalt Blue is a clean medium-blue pigment discovered by French chemist Louis Thénard in the early 1800’s and was an alternative to the very expensive Lapis Lazuli.
A synthetic inorganic pigment with excellent lightfast properties.
|Series||Colour Index||Chemical Description||Classification||Opacity||ASTM|
|4||PB28||Oxides of Cobalt and Aluminum||Synthetic Inorganic||Semi Transparent||ASTMI|
ASTM Approved Permanent Colours American Society for Testing and Materials, conforming to standard D4302-90.