Iron Pigments:
- Yellow Ochre: a naturally occurring clay of monohydrated ferric oxide (Fe2O3.H2O)
Red pigments
Iron oxide pigments:
- Red Ochre: anhydrous Fe2O3
- Burnt Sienna: a pigment produced by heating Raw Sienna.
Brown pigments
Clay earth pigments (naturally formed iron oxides)
- Raw Umber: a natural clay pigment consisting of iron oxide, manganese oxide and aluminum oxide: Fe2O3 + MnO2 + nH2O + Si + AlO3. When calcined (heated) it is referred to as Burnt Umber and has more intense colors.
- Raw Sienna: a naturally occurring yellow-brown pigment from limonite clay.