Si·en·na n. Chem. 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.
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.
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raw sienna
n 1: a medium to dark tan color [syn: yellowish brown, buff,
caramel, caramel brown]
2: a yellowish-brown pigment made from untreated sienna