Raw umber

Raw umber

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

Raw umber

Other Properties

Slightly soluble in acids giving a yellow solution. Turns reddish brown when heated.

Density	3.2
Refractive Index	1.87-2.17

Hazards and Safety

Toxic.

Additional Images

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  Raw umber

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  Raw umber

Authority

• 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

• Website address 1 Comment: Pigments Through the Ages - http://webexhibits.org/pigments/indiv/overview/umbra.html

• Website address 2 Comment: 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