Sienna /(?)/

Si·en·na

Sienna

n.
  1. Clay that is colored red or brown by the oxides of iron or manganese, and used as a pigment. It is used either in the raw state or burnt. (Chem.)

Phrases & Compounds
Burnt sienna
sienna made of a much redder color by the action of fire.
Raw sienna
sienna in its natural state, of a transparent yellowish brown color.