The generic name that is given to the class of pigments called mixed metal oxide pigments best describes the cobalt based pigments. The Mixed metal oxide pigments gives high performance when it comes to their application as colourants.
Constant researches has led to the development of new cobalt blue and
blue-green pigments. They are often termed as the second generation
pigments. Features like enhanced UV absorption and imparting
durability to are their USP. Pigments like Cobalt chrome aluminate
blue-green pigments show very good absorption rates. They transmit even
less than 0.1% light in the Ultra violet region. These mixed metal oxide
pigments (second generation pigments) owe their excellent
absorptive properties to a fine particle size distribution. This
excellent property is shown in the form of a graph.