- a ferruginous earth used as a yellowish-brown pigment (raw sienna ) or, after roasting in a furnace, as a reddish-brown pigment (burnt sienna ).
- the color of such a pigment.
- a natural earth containing ferric oxide used as a yellowish-brown pigment when untreated (raw sienna) or a reddish-brown pigment when roasted (burnt sienna)
- the colour of this pigment
