Natural is in fashion
Vegetable tanning is today’s most classic, traditional and recognisable technique compared to other types of tanning. It is the only method that can impart unique properties to leather and respects the environment. Vegetable tanned leathers combine comfort, beauty, fashion, versatility and uniqueness.
The texture and smell of leather produced using vegetable extracts is natural. The leathers are produced by skilled craftsmen blending the best extracts with selected natural oils and fatliquors, the smell becomes a perfume for leather lovers. Bags, rugs, briefcases, belts, chairs, boots and saddles are a few of the things made by using all natural extracts.
Like all natural things leathers which are produced using natural vegetable extracts have their own life. Vegetable tanned leathers are not the same for their entire life, but change continuously for the better. When the leather is brand new the colour is bright and has a warm touch and a good feeling. Leathers tanned with these extracts slightly change their appearance after a period of wear and aging, they become less bright while maintaining a warm and silky touch.
Vegetable extracts and tanning
The term tannin was used the first time in 1796 to indicate a substance present in vegetable extracts capable of forming insoluble complexes with proteins of animal skin by preventing the action of proteolytic enzymes that could affect the physical condition of the skin. This process has been practiced over the years more and more frequently so that it is the basic tanning principle for the production of sole leathers. Tannins are gathered from many types of trees and plants and can be present either in bark, leaves, wood or even in fruits and roots. Only tannins are able to give tanned leather these unique characteristics that make them so special and so easily distinguishable. The “smell of leather” for example, is something typical and unique conferring distinctive characteristics.
In today’s tanning process, craftsmen use vegetable tannins in both liquid and powder form. From the chestnut wood the most famous and ancient extract is obtained. Equally common in vegetable tanning is the quebracho extract obtained from the wood of a tree that grows primarily in Argentina: this extract gives the leather a special reddish colour and an unmistakable warm touch and a bright appearance.
In addition to chestnut and quebracho extracts, Tara tannins are mainly used in automotive upholstery. Minosa extracts (Tanwat) which give a special pink colour to hides are suitable for leather goods, shoe uppers and leather soles. Gambier extracts are mainly used for full grain and fine valuable articles. Finally, myrobalan extracts produce leathers with a uniform colour and a soft touch.
|Product name||Description||Physical status||Tannins content (%)*||Humidity (%)||pH (6.9°Bè)|
|Chestnut N||Astringent chestnut extract||Powder / Liquid||76 ± 1.0||Max 8||3.5 ± 0.3|
|Chestnut N2||Astringent chestnut extract||Powder||76 ± 1.0||Max 8||3.5 ± 0.3|
|Dulcotan RN||Sweetened chestnut extract||Powder||72 ± 1.0||Max 8||4.5 ± 0.2|
|Dulcotan Special||Sweetened chestnut extract||Powder||72 ± 1.0||Max 8||4.5 ± 0.2|
|Indusol ATO||Cold soluble ordinary quebracho extract||Powder||72 ± 1.5||Max 8||4.7 ± 0.3|
|Indusol ATG||Cold soluble quebracho extract||Powder||72 ± 1.5||Max 8||4.6 ± 0.3|
|Indusol ATS||Partly soluble quebracho extract||Powder||72 ± 1.5||Max 8||4.6 ± 0.3|
|Indusol ATD||Partly soluble quebracho extract||Powder||72 ± 1.5||Max 8||4.4 ± 0.3|
|Ormotan T||Tara tannin||Powder||Min 48||Max 13||3.4 ± 0.4|
|Tara Extra Liquid||Tara tannin||Liquid||Min 27||Max 60||4.0 ± 0.3|
|Gambier CM||Gambier extract||Powder||Min 50||Max 12||4.6 ± 0.3|
|Gambier Purified Liq.||Gambier extract||Liquid||Min 28||Max 65||3.8 ± 0.3|
|Myrobalan||Myrobalan extract||Powder||Min 70||Max 8||3.4 ± 0.3|
* The tannin content is carried out using the Filter method.