Raw sienna

From CAMEO
Jump to: navigation, search
Raw sienna

Description

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.)

FTIR (MFA)

Raw Sienna (245).TIF

Raman (MFA)

Raw sienna (Forbes MFA 254) resize.tif

SEM

F254sem.jpg

EDS

F254edsbw.jpg


Density 3.14
Refractive Index 1.87-2.17

Additional Images


Sources Checked for Data in Record

  • 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