Difference between revisions of "Tawing with alum"
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==Tawing with alum - Alum tanned== | ==Tawing with alum - Alum tanned== | ||
| − | ''Tawing is | + | ''Tawing is a method of tanning with aluminium salts (alum). It is a naturally-occurring double salt, but which is also artificially produced. Tawing comes under [[mineral tanning]] and is one of the oldest [[Tanning leather|tanning processes]]. After tanning with alum, the [[Drying leather|dried leather]] is stiff and firm. To make it softer, the leather is then [[Softening|tumbled]] and [[Oils & fats in the leather industry|greased]]. |
| − | + | Alum tanning makes the leather white and very water-sensitive. The tannins are washable, making this leather much more sensitive than with [[Chrome tanned|chrome tanning]] which, with a few exceptions such as for [[Sheepskin - Lambskin|Sheepskin]], has replaced alum tanning. | |
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| − | [[bild:Lammfell-01.jpg| | + | [[bild:Lammfell-01.jpg|500px]] |
| − | [[bild:Riemen-Alaungerbung-01.jpg| | + | </p> |
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| + | [[bild:Riemen-Alaungerbung-01.jpg|500px]] | ||
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| − | ''Alum tanning: [[Leather ball|Cricket ball]] from England | + | ''Alum tanning: [[Leather ball|Cricket ball]] from England.''<br></p> |
<p> </p> | <p> </p> | ||
==Glacé leather== | ==Glacé leather== | ||
| − | + | Glacé tanning is a form of traditional white tanning and is based on natural ingredients. These include alum (aluminium sulphate), salt, egg yolk, wheat flour, fats and water. The tanning itself is a very short process, which takes only a few hours. | |
Glacé leather has traditionally been used as [[Leather gloves|glove leather]] (usually [[goatskin]]). | Glacé leather has traditionally been used as [[Leather gloves|glove leather]] (usually [[goatskin]]). | ||
| − | Nowadays glacé leather is | + | Nowadays glacé leather is described, when the [[Tanning leather|tanning method]] is not clear. Leather with "glacé effect" is also offered. In such cases, the [[Tanning leather|tanning method]] is then deviated. It's generally not clear what is meant by "glacé effect". |
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| − | ''Glacé gloves are very sensitive to water due to the non-permanent, washable tanning. The ring finger of this glove was irreparably damaged by moisture.''<br></p> | + | ''Glacé [[leather gloves|gloves]] are very sensitive to water due to the non-permanent, washable tanning. The ring finger of this glove was irreparably damaged by moisture.''<br></p> |
<p> </p> | <p> </p> | ||
| − | < | + | <p align=center> |
| − | + | [[bild:Alum-leather-jacket-Italy-stains.jpg|500px]] | |
| + | </p> | ||
| + | <p align=center> | ||
| + | ''Alum designer [[Leather clothing|leather jacket]] from Italy with water stains on the back from 2017. The stains cannot be removed.''<br></p> | ||
| + | <p> </p> | ||
== Additional information == | == Additional information == | ||
Latest revision as of 18:43, 24 April 2023
Tawing with alum - Alum tanned
Tawing is a method of tanning with aluminium salts (alum). It is a naturally-occurring double salt, but which is also artificially produced. Tawing comes under mineral tanning and is one of the oldest tanning processes. After tanning with alum, the dried leather is stiff and firm. To make it softer, the leather is then tumbled and greased.
Alum tanning makes the leather white and very water-sensitive. The tannins are washable, making this leather much more sensitive than with chrome tanning which, with a few exceptions such as for Sheepskin, has replaced alum tanning.
Alum tanning: Sheepskin and leather straps.
Alum tanning: Leather belt with braided parchment.
Alum tanning: Cricket ball from England.
Glacé leather
Glacé tanning is a form of traditional white tanning and is based on natural ingredients. These include alum (aluminium sulphate), salt, egg yolk, wheat flour, fats and water. The tanning itself is a very short process, which takes only a few hours.
Glacé leather has traditionally been used as glove leather (usually goatskin).
Nowadays glacé leather is described, when the tanning method is not clear. Leather with "glacé effect" is also offered. In such cases, the tanning method is then deviated. It's generally not clear what is meant by "glacé effect".
Glacé gloves are very sensitive to water due to the non-permanent, washable tanning. The ring finger of this glove was irreparably damaged by moisture.
Alum designer leather jacket from Italy with water stains on the back from 2017. The stains cannot be removed.
Additional information
- Tanning leather
- Tannins
- Mineral tanning
- Chrome tanned
- Vegetable-tanned leather
- Synthetic tanned
- Tanning with fats and oils
- Chamois leather
- Brain tanning
| Tanning methods |
|---|
| Chrome tanning - Vegetable-tanned leather - Synthetic tanning - Tanning with fats and oils |
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