Difference between revisions of "Raw umber"
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[[File:Raw.umber_det.jpg|thumb|Raw umber]] | [[File:Raw.umber_det.jpg|thumb|Raw umber]] | ||
== Description == | == Description == | ||
| − | + | [[File:564 raw umber.jpg|thumb|Raw umber]] | |
A pale yellowish brown natural earth pigment that contains [[manganese%20dioxide|manganese dioxide]] and [[ferric%20hydroxide|iron hydroxide]]. See [[umber|umber]]. | A pale yellowish brown natural earth pigment that contains [[manganese%20dioxide|manganese dioxide]] and [[ferric%20hydroxide|iron hydroxide]]. See [[umber|umber]]. | ||
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Pigment Brown 7; CI 77492; umbra; terre d'ombre naturelle (Fr.); Umbra natur (Deut.); ombra omi (Gr.); terra d'ombra naturale (It.); ruwe omber (Ned.); grisaille; Sicilian brown | Pigment Brown 7; CI 77492; umbra; terre d'ombre naturelle (Fr.); Umbra natur (Deut.); ombra omi (Gr.); terra d'ombra naturale (It.); ruwe omber (Ned.); grisaille; Sicilian brown | ||
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== Risks == | == Risks == | ||
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! scope="row"| Density | ! scope="row"| Density | ||
| − | | 3.2 | + | | 3.2 g/ml |
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! scope="row"| Refractive Index | ! scope="row"| Refractive Index | ||
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<gallery> | <gallery> | ||
| − | File:21_Raw umber_500X.jpg|Raw umber | + | File:21_Raw umber_500X.jpg|Raw umber at 500s<br> transmitted light |
| − | File:21_Raw umber_500X_pol.jpg|Raw umber | + | File:21_Raw umber_500X_pol.jpg|Raw umber at 500x<br>Polarized light |
</gallery> | </gallery> | ||
Latest revision as of 15:56, 4 August 2022
Description
A pale yellowish brown natural earth pigment that contains Manganese dioxide and iron hydroxide. See Umber.
Synonyms and Related Terms
Pigment Brown 7; CI 77492; umbra; terre d'ombre naturelle (Fr.); Umbra natur (Deut.); ombra omi (Gr.); terra d'ombra naturale (It.); ruwe omber (Ned.); grisaille; Sicilian brown
Risks
Toxic.
Physical and Chemical Properties
Slightly soluble in acids giving a yellow solution. Turns reddish brown when heated.
| Density | 3.2 g/ml |
|---|---|
| Refractive Index | 1.87-2.17 |
Additional Images
Raw umber at 500s
transmitted light
Raw umber at 500x
Polarized light
Resources and Citations
- R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966 Comment: density = 3.20 and ref. index = 1.87-2.17
- Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
- R.D. Harley, Artists' Pigments c. 1600-1835, Butterworth Scientific, London, 1982
- Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
- Pigments Through the Ages - http://webexhibits.org/pigments/indiv/overview/umbra.html
- Website: http://www.coloria.net/varita.htm
- Art and Architecture Thesaurus Online, http://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000