Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by function]
6. colorant (material)
7. pigments
8. [pigment by color]
9. blue pigment
10. synthetic inorganic blue pigment

Anotations

Scope note:

Synthetic sky blue pigment composed of cobalt stannate; it is inert, lightfast, unaffected by acids or alkalis, and expensive. It is made by a process developed in Germany in 1805; originally sold as a pigment in 1860 under the name "Coeruleum."