Category:Sienna

Si*en"na, n. Etym: [it. terra di siena, fr. Siena in italy.] (chem.)

Defn: 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.