Difference between revisions of "Burnt umber"

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== Description ==
 
== Description ==
  
A chocolate brown iron ore pigment made by roasting [http://cameo.mfa.org/materials/fullrecord.asp?name=raw%20umber raw umber]. Burnt umber contains [http://cameo.mfa.org/materials/fullrecord.asp?name=iron%20oxide%20red iron oxide] and [http://cameo.mfa.org/materials/fullrecord.asp?name=manganese%20dioxide manganese dioxide]. The heat treatment converts the yellowish [http://cameo.mfa.org/materials/fullrecord.asp?name=ferric%20hydroxide iron hydroxides] to brownish iron oxides which produces a dark brown pigment with a reddish tone. Burnt umber is a permanent pigment that has been used in oil and watercolor paints.
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A chocolate brown iron ore pigment made by roasting [[raw umber]]. Burnt umber contains [[iron%20oxide%20red|iron oxide]] and [[manganese dioxide]]. The heat treatment converts the yellowish [[ferric%20hydroxide|iron hydroxides]] to brownish iron oxides which produces a dark brown pigment with a reddish tone. Burnt umber is a permanent pigment that has been used in oil and watercolor paints.
  
 
[[File:Burnt.umber.powder_det.jpg|thumb|Burnt umber]]
 
[[File:Burnt.umber.powder_det.jpg|thumb|Burnt umber]]
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== Synonyms and Related Terms ==
 
== Synonyms and Related Terms ==
  
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Toxic by ingestion. May cause manganese poisoning.
 
Toxic by ingestion. May cause manganese poisoning.
  
== Authority ==
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== Sources Checked for Data in Record ==
  
 
* R. J. Gettens, G.L. Stout, ''Painting Materials, A Short Encyclopaedia'', Dover Publications, New York, 1966  Comment: density 3.64 and ref. index 2.2-2.3
 
* R. J. Gettens, G.L. Stout, ''Painting Materials, A Short Encyclopaedia'', Dover Publications, New York, 1966  Comment: density 3.64 and ref. index 2.2-2.3

Latest revision as of 13:17, 29 April 2016

Burnt umber

Description

A chocolate brown iron ore pigment made by roasting raw umber. Burnt umber contains iron oxide and manganese dioxide. The heat treatment converts the yellowish iron hydroxides to brownish iron oxides which produces a dark brown pigment with a reddish tone. Burnt umber is a permanent pigment that has been used in oil and watercolor paints.

Burnt umber

Synonyms and Related Terms

Pigment Brown 7; CI 77492; terre d'ombre brûlée (Fr.); Gebrannte Umbra (Deut.); sombra tostada (Esp.); ombra psimenii (Gr.); terra d'ombra bruciata (It.); bruno di Roma (It.); bruine omber (Ned.); Caledonia brown; Cappagh brown; mineral brown; Turkey umber; jacaranda brown; chestnut brown;

Density 3.64
Refractive Index 2.2 - 2.3

Hazards and Safety

Toxic by ingestion. May cause manganese poisoning.

Sources Checked for Data in Record

  • R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966 Comment: density 3.64 and ref. index 2.2-2.3
  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 558
  • Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
  • R.D. Harley, Artists' Pigments c. 1600-1835, Butterworth Scientific, London, 1982
  • Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982
  • Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998