Probably the most popular black.
An impure amorphous Carbon in Calcium Phosphate. Ivory Black is no longer made from burning ivory scraps but from charred animal bones.
It is denser in shade and warmer than Lamp Black, however it's semi opaque nature make it weaker in mixes and slightly slippier in handling.
Pigment - PBk 9
Vehicle - Linseed Oil
Opacity - Semi-Opaque