Difference between revisions of "Oak bark"

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== Description ==
 
== Description ==
  
The bark from several species of oak contains up to 14% water-soluble dyes and tannins. The wood also contains tannins but in smaller quantities. Oak tannins contain [http://cameo.mfa.org/materials/fullrecord.asp?name=pyrogallol pyrogallol] and condensed tannins. They have a neutral pH, a moderate salt content and are used to produce a fine, heavy leather. Oak bark extracts are also used for dyeing. They produce colors ranging from black (black oak, [http://cameo.mfa.org/materials/fullrecord.asp?name=quercitron quercitron]) to rose-tan (red oak) to khaki (white oak). Oak dyes have good fastness to light and washing.
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The bark from several species of oak contains up to 14% water-soluble dyes and tannins. The wood also contains tannins but in smaller quantities. Oak tannins contain [[pyrogallol tannin|pyrogallol]] and condensed tannins. They have a neutral pH, a moderate salt content and are used to produce a fine, heavy leather. Oak bark extracts are also used for dyeing. They produce colors ranging from black (black oak, [[quercitron|quercitron]]) to rose-tan (red oak) to khaki (white oak). Oak dyes have good fastness to light and washing.
  
 
== Synonyms and Related Terms ==
 
== Synonyms and Related Terms ==
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casca de carvalho (Port.); oak extract
 
casca de carvalho (Port.); oak extract
  
== Sources Checked for Data in Record ==
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== Resources and Citations ==
  
 
* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971  Comment: p. 556
 
* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971  Comment: p. 556

Latest revision as of 08:42, 19 August 2020

White oak Quercus alba

Description

The bark from several species of oak contains up to 14% water-soluble dyes and tannins. The wood also contains tannins but in smaller quantities. Oak tannins contain pyrogallol and condensed tannins. They have a neutral pH, a moderate salt content and are used to produce a fine, heavy leather. Oak bark extracts are also used for dyeing. They produce colors ranging from black (black oak, Quercitron) to rose-tan (red oak) to khaki (white oak). Oak dyes have good fastness to light and washing.

Synonyms and Related Terms

casca de carvalho (Port.); oak extract

Resources and Citations

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 556
  • 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
  • F. Crace-Calvert, Dyeing and Calico Printing, Palmer & Howe, London, 1876