Difference between revisions of "Catechol tannin"
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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. | 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. | ||
| − | == | + | ==Physical and Chemical Properties== |
Soluble in water, ethanol. | Soluble in water, ethanol. | ||
| − | == | + | == Resources and Citations == |
* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 796 | * G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 796 | ||
Latest revision as of 07:44, 24 May 2022
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.
Physical and Chemical Properties
Soluble in water, ethanol.
Resources and Citations
- 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