Difference between revisions of "Catechutannic acid"
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== Description == | == Description == | ||
| − | A natural tannin found in | + | A natural [[tannin]] found in [[Cutch (dye)|Cutch]], which is an extract obtained from the heartwood, leaves, pods and twigs of several trees, such as ''Acacia catechu'' or ''Uncaria gambier'', that are native to southeast Asia and India. Cutch produces a stiff yellow [[leather]]. The primary tannins are catechutannic acid (25-35%) and [[catechin]] (2-10%). |
| − | == | + | == Physical and Chemical Properties == |
| − | Soluble in water, alcohol. Insoluble in ether. | + | * Soluble in water, alcohol. Insoluble in ether. |
| + | * Produces a green precipitate with iron salts. | ||
| + | * Oxidizes to red in the presence of atmospheric acids. | ||
| − | + | == Resources and Citations == | |
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* Matt Roberts, Don Etherington, ''Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology'', U.S. Government Printing Office, Washington DC, 1982 | * Matt Roberts, Don Etherington, ''Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology'', U.S. Government Printing Office, Washington DC, 1982 | ||
Latest revision as of 08:45, 24 May 2022
Description
A natural Tannin found in Cutch, which is an extract obtained from the heartwood, leaves, pods and twigs of several trees, such as Acacia catechu or Uncaria gambier, that are native to southeast Asia and India. Cutch produces a stiff yellow Leather. The primary tannins are catechutannic acid (25-35%) and Catechin (2-10%).
Physical and Chemical Properties
- Soluble in water, alcohol. Insoluble in ether.
- Produces a green precipitate with iron salts.
- Oxidizes to red in the presence of atmospheric acids.
Resources and Citations
- Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982
- F. Crace-Calvert, Dyeing and Calico Printing, Palmer & Howe, London, 1876