3 different recipes. Brands sell different pigment mixtures under this name, so they won't all look or mix alike. Compare the pigments below; the most common is PBk9 Ivory / Bone Black.
Who makes it
PBk9 Ivory / Bone Black2
- Rembrandt Artists' Oil Colour No. 717
PBk7 Carbon Black + PG7 Phthalo Green1
- Lukas 1862 Artists' Oil No. 0192
Sizes are the ones each line is sold in; marks a size only some colors come in. Check the store for a particular color.