- This synthetic copper blue (copper calcium carbonate) used to be made from marsh lime and copper liquors. This is a lighter blue with a similar chemical composition to azurite.
- Chemical description: Basic Copper calcium carbonate
- ColorIndex: PB 30.77420
- Suitability: Tempera, Watercolor / Gouache
- Colors: Blue, Turquoise
- Forms: powder
- Solubility in water: insoluble