Raw umber

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Raw umber

Contents

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


Sources Checked for Data in Record

  • 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

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