World Library  
Flag as Inappropriate
Email this Article

Umber

Article Id: WHEBN0000561853
Reproduction Date:

Title: Umber  
Author: World Heritage Encyclopedia
Language: English
Subject: Sienna, Brown, Ochre, Shades of brown, Manganese
Collection: Iron Minerals, Iron Oxide Pigments, Manganese Minerals, Oxide Minerals, Shades of Brown
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Umber

Umber
.
    Color coordinates
Hex triplet #635147
sRGBB  (rgb) (99, 81, 71)
CMYKH   (c, m, y, k) (0, 18, 28, 61)
HSV       (h, s, v) (21°, 28%, 39[1]%)
Source ISCC NBS
B: Normalized to [0–255] (byte)
H: Normalized to [0–100] (hundred)

Umber is a natural brown or reddish-brown earth pigment that contains iron oxide and manganese oxide. It is darker than the other similar earth pigments, ochre and sienna.[2]

In its natural form, it is called raw umber. When heated (calcinated), the color becomes more intense, and the color is known as burnt umber.

The name comes from terra di ombra, or earth of Umbria, the Italian name of the pigment. Umbria is a mountainous region in central Italy where the pigment was originally extracted.[3] The word also may be related to the Latin word Umbra.[4]

Umber is not one precise color, but a range of different colors, from medium to dark, from yellowish to reddish to grayish. The color of the natural earth depends upon the amount of iron oxide and manganese in the clay. Umber earth pigments contain between five and twenty percent manganese oxide, which accounts for their being a darker color than yellow ochre or sienna.[5] Commercial colors vary depending upon the manufacturer or the color list. Not all umber pigments contain natural earths; some contain synthetic iron and manganese oxide, indicated on the label. Pigments containing the natural umber earths indicate them on the label as PBr7 (Pigment brown 7), following the Colour Index International system.

The color shown in the box at right is one of the many commercial varieties of umber, from the ISCC-NBS color list: ISCC-NBS Dictionary of Color Names (1955)--Color Sample of Umber (color sample #61).

Contents

  • History 1
  • Varieties 2
    • Raw umber 2.1
    • Burnt umber 2.2
  • See also 3
  • References 4
  • Sources and citations 5
  • External links 6

History

Umber was one of the first pigments used by man; it is found along with carbon black, red and yellow ocher in cave paintings from the neolithic period.

Dark brown pigments were rarely used in Medieval art; artists of that period preferred bright, distinct colors such as red, blue and green, rather than colorless colors. The umbers were not widely used in Europe before the end of the fifteenth century; The Renaissance painter and writer

  • Discussion of umber and its use by Vermeer and other painters

External links

  1. ^ web.forret.com Color Conversion Tool set to hex code of color #635147 (Umber):
  2. ^ Shorter Oxford English Dictionary, Fifth Edition, Oxford University Press, 2002. "A red brown earth containing iron and manganese oxides and darker than ochre and sienna, used to make various pigments."
  3. ^ Shorter Oxford English Dictionary, Fifth Edition, Oxford University Press, 2002.
  4. ^ Blick Art Materials, 00501-8054 — Burnt Umber
  5. ^ Roelofs, Isabelle (2012). La couleur expliquée aux artistes. Groupe Eyrolles.   p. 30
  6. ^ Daniel V. Thompson, (1956), The Materials and Techniques of Medieval Painting, p. 88-89
  7. ^ http://www.webexhibits.org/pigments/indiv/overview/umber.html Webexhibits- Pigments through the Ages.
  8. ^ http://www.webexhibits.org/pigments/intro/industrialization.html Web-exhibits- Pigments through the ages.
  9. ^ web.forret.com Color Conversion Tool set to hex code of color #826644 (Raw Umber):
  10. ^ Maerz and Paul A Dictionary of Color New York:1930 McGraw-Hill Page 191; Color Sample of Burnt Umber: Page 53 Plate 15 Color Sample A12

Sources and citations

  • Isabelle Roelofs and Fabien Petillion, La couleur expliquée aux artistes, Editions Eyrolles, (2012), ISBN 978-2-212-13486-5.
  • Philip Ball, Histoire vivante des couleurs (2001), Hazan Publishers, Paris, ISBN 978-2-754105-033
  • Daniel V. Thompson, The Materials and Techniques of Medieval Painting (1956), Dover Publications, New York (ISBN 0-486-20327-1)

References

See also

The first recorded use of burnt umber as a color name in English was in 1650.[10]

Burnt umber is made by heating raw umber, which dehydrates the iron oxides and changes them partially to the more reddish hematite. It is used for both oil and water color paint.

Burnt umber
.
    Color coordinates
Hex triplet #8A3324
sRGBB  (rgb) (138, 51, 36)
CMYKH   (c, m, y, k) (0, 63, 74, 46)
HSV       (h, s, v) (9°, 74%, 54%)
Source Xona.com Color List
B: Normalized to [0–255] (byte)
H: Normalized to [0–100] (hundred)

Burnt umber

The source of this color is: ISCC-NBS Dictionary of Color Names (1955)--Color Sample of Raw Umber (color sample #77).

Displayed at the right is one version of the color raw umber.

Raw Umber
.
    Color coordinates
Hex triplet #826644
sRGBB  (rgb) (130, 102, 68)
CMYKH   (c, m, y, k) (0, 22, 48, 49)
HSV       (h, s, v) (33°, 48%, 51[9]%)
Source ISCC NBS
B: Normalized to [0–255] (byte)
H: Normalized to [0–100] (hundred)

Raw umber

Varieties

In the 20th century, natural umber pigments began to be replaced by pigments made with synthetic iron oxide and manganese oxide. Natural umber pigments are still being made, with Cyprus as a prominent source. Pigments containing the natural earths are labeled as PBr7, or Brown pigment 7.

In the second half of the 19th century, the Impressionists rebelled against the use of umber and other earth colors. Camille Pissarro denounced the "old, dull earth colors" and said he had banned them from his palette.[8] The impressionists chose to make their own browns from mixtures of red, yellow, green, blue and other pigments, particularly the new synthetic pigments such as cobalt blue and emerald green that had just been introduced.

The great age of umber was the baroque period, where it often provided the dark shades in the chiaroscuro (light-dark) style of painting. It was an important part of the palette of Caravaggio (1571-1610) and Rembrandt (1606-1669). Rembrandt used it as an important element of his rich and complex browns, and he also took advantage of its other qualities; it dried more quickly than other browns, and therefore he often used it as a ground so he could work more quickly. or mixed it with other pigments to speed up the drying process.[7] The Dutch artist Johannes Vermeer used umber to create shadows on whitewashed walls that were warmer and more harmonious than those created with black pigment.

[6]

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.