As a tanning material mangrove bark has both advantages and disadvantages. Its principal disadvantage is the reddish color it imparts to leather (See also: HEMLOCK ), although this can readily be overcome by mixing mangrove with other tanning materials which modify or reduce the intensity of the color. The leather produced by the use of mangrove alone also tends to be harsh and thick-grained. When used with other tannins, however, as it usually is, mangrove provides a very satisfactory tannage. The rate of penetration of the tannin is slower than with such tannins as wattle or quebracho, but can be increased by sulfiting.
Mangrove is considered to be the most economical and abundant vegetable tannin available today. It is one of the condensed class of tannins, has a fairly high pH and a relatively low acids content. It is very soluble and develops a minimum of insoluble matter. It also produces very little sludge in the tanning liquor.
Mangrove is inaccurately (but persistently) referred to as "cutch" or "kutch." See also: VEGETABLE TANNINS . (175 , 306 , 363 )
Timestamp: Saturday, 19-Nov-2011 13:18:42 PST
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