Difference between revisions of "Raw sienna"
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[[File:254 raw sienna.jpg|thumb|Raw sienna]] | [[File:254 raw sienna.jpg|thumb|Raw sienna]] | ||
== Description == | == Description == | ||
| − | + | [[File:rawsienna C100x.jpg|thumb|Raw sienna at 100x (visible light left; UV light right)]] | |
A dark yellow iron oxide pigment. Raw sienna is a natural earth mixture that contains at least 50% hydrated ferric oxide ([[goethite|goethite]]) mixed with [[alumina|alumina]], [[clay|clay]], and some [[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. | A dark yellow iron oxide pigment. Raw sienna is a natural earth mixture that contains at least 50% hydrated ferric oxide ([[goethite|goethite]]) mixed with [[alumina|alumina]], [[clay|clay]], and some [[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. | ||
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== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
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|- | |- | ||
! scope="row"| Density | ! scope="row"| Density | ||
| − | | 3.14 | + | | 3.14 g/ml |
|- | |- | ||
! scope="row"| Refractive Index | ! scope="row"| Refractive Index | ||
| Line 22: | Line 21: | ||
== Additional Images == | == Additional Images == | ||
<gallery> | <gallery> | ||
| − | File:19_Raw_sienna_500X.jpg|Raw sienna | + | File:19_Raw_sienna_500X.jpg|Raw sienna at 500x<br>Transmitted light |
| − | File:19_Raw_sienna_500X_pol.jpg|Raw sienna | + | File:19_Raw_sienna_500X_pol.jpg|Raw sienna at 500x<br>Polarized light |
</gallery> | </gallery> | ||
| Line 38: | Line 37: | ||
* ''Dictionary of Building Preservation'', Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996 | * ''Dictionary of Building Preservation'', Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996 | ||
| − | * Art and Architecture Thesaurus Online, | + | * Art and Architecture Thesaurus Online, https://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000 |
[[Category:Materials database]] | [[Category:Materials database]] | ||
Latest revision as of 15:51, 4 August 2022
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.)
Physical and Chemical Properties
| Density | 3.14 g/ml |
|---|---|
| Refractive Index | 1.87-2.17 |
Additional Images
Raw sienna at 500x
Transmitted light
Raw sienna at 500x
Polarized light
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
- Art and Architecture Thesaurus Online, https://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000