Difference between revisions of "Raw sienna"
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== Description == | == Description == | ||
| − | A dark yellow iron oxide pigment. Raw sienna is a natural earth mixture that contains at least 50% hydrated ferric oxide ([http://cameo.mfa.org/materials/fullrecord.asp?name=goethite goethite]) mixed with [http://cameo.mfa.org/materials/fullrecord.asp?name=alumina alumina], [http://cameo.mfa.org/materials/fullrecord.asp?name=clay clay], and some [http://cameo.mfa.org/materials/fullrecord.asp?name=manganese | + | A dark yellow iron oxide pigment. Raw sienna is a natural earth mixture that contains at least 50% hydrated ferric oxide ([http://cameo.mfa.org/materials/fullrecord.asp?name=goethite goethite]) mixed with [http://cameo.mfa.org/materials/fullrecord.asp?name=alumina alumina], [http://cameo.mfa.org/materials/fullrecord.asp?name=clay clay], and some [http://cameo.mfa.org/materials/fullrecord.asp?name=manganese%20dioxide 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. |
[[File:rawsienna C100x.jpg|thumb|Raw sienna]] | [[File:rawsienna C100x.jpg|thumb|Raw sienna]] | ||
Revision as of 12:03, 13 June 2013
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.
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.)
| Density | 3.14 |
|---|---|
| Refractive Index | 1.87-2.17 |
Additional Images
Raw sienna
Raw sienna
Authority
- R. J. Gettens, G.L. Stout, R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966
- G.S.Brady, G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 577
- Ralph Mayer, Ralph Mayer, A Dictionary of Art Terms and Techniques, Harper and Row Publishers, New York, 1969 (also 1945 printing)
- Michael McCann, 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
- Art and Architecture Thesaurus Online, http://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000