Raw sienna

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Raw sienna


A dark yellow iron oxide pigment. Raw sienna is a natural earth mixture that contains at least 50% hydrated ferric oxide (Goethite) mixed with Alumina, Clay, and some Manganese dioxide. Raw sienna is a semi-opaque, permanent pigment. It was named for the south Italian city of Siena that produced fine grades of the pigment; it was originally called Italian earth.

Raw sienna

Synonyms and Related Terms

Pigment Brown 6; CI 77491; Italian earth; terre de Sienne (Fr.); terra di Siena (It.); Sienaerde (Deut.); siena natural (Esp.); siena natural (Port.)


Raw Sienna (245).TIF

Raman (MFA)

Raw sienna (Forbes MFA 254) resize.tif





Physical and Chemical Properties

Density 3.14
Refractive Index 1.87-2.17

Additional Images

Resources and Citations

  • R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966
  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 577
  • Ralph Mayer, A Dictionary of Art Terms and Techniques, Harper and Row Publishers, New York, 1969 (also 1945 printing)
  • Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
  • Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996