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 PBr7 Natural Iron Oxide.
Who makes it
PBr7 Natural Iron Oxide2
- Blockx Extra-Fine Oil Colours No. 212145
PR101 Red Iron Oxide + PY42 Yellow Iron Oxide1
- Williamsburg Handmade Oil Colors No. 6001561
PBk11 Mars Black + PR101 Red Iron Oxide1
- Rembrandt Artists' Oil Colour No. 430
Sizes are the ones each line is sold in; marks a size only some colors come in. Check the store for a particular color.