Difference between revisions of "Catechol tannin"
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== Description == | == Description == | ||
| − | One of two general classes of [ | + | One of two general classes of [[vegetable tannin|vegetable tannins]]. The other class is [[pyrogallol tannin|pyrogallol]]. Catechol tannins contain an organic phenolic compound(s). Examples are [[cutch (dye)|cutch]], [[quebracho]], [[hemlock bark]], [[gambier]], and [[willow bark]]. Catechol tannins give a greenish-black precipitate with iron salts. They produce leathers that are more resistant to heat and decay than pyrogallols. |
== Other Properties == | == Other Properties == | ||
Revision as of 15:02, 12 January 2014
Description
One of two general classes of vegetable tannins. The other class is pyrogallol. Catechol tannins contain an organic phenolic compound(s). Examples are cutch, Quebracho, Hemlock bark, Gambier, and Willow bark. Catechol tannins give a greenish-black precipitate with iron salts. They produce leathers that are more resistant to heat and decay than pyrogallols.
Other Properties
Soluble in water, ethanol.
Authority
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 796
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998