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Tanning, or hide tanning, is the process of treating skins and hides of animals to produce leather. A tannery is the place where the skins are processed. Historically, vegetable based tanning used tannin , an acidic chemical compound derived from the bark of certain trees, in the production of leather.
The copperas solution was used in the leather tanning industry. Copperas works are manufactories where copperas (iron(II) sulfate) is produced from pyrite, often obtained as a byproduct during coal mining, and iron. The history of producing green vitriol, as it was known, goes back hundreds of years in Scotland. [1]
splitting - the leather is split into one or more horizontal layers. shaving - the leather is thinned using a machine which cuts leather fibres off. neutralisation - the pH of the leather is adjusted to a value between 4.5 and 6.5. retanning - additional tanning agents are added to impart properties. dyeing - the leather is coloured.
A tanner treating leather in Morocco. Bating is a technical term used in the tanning industry to denote leather that has been treated with hen or pigeon manure, similar to puering (see puer) where the leather has been treated with dog excrement, and which treatment, in both cases, was performed on the raw hide prior to tanning in order to render the skins, and the subsequent leather, soft and ...
The term tannin (from scientific French tannin, from French tan "crushed oak bark", tanner "to tan", cognate with English tanning, Medieval Latin tannare, from Proto-Celtic *tannos "oak") refers to the abundance of these compounds in oak bark, which was used in tanning animal hides into leather.
Chromium alum is used in the tanning of leather [1] as chromium(III) stabilizes the leather by cross linking the collagen fibers within the leather. [3] However, this application is obsolete because the simpler chromium(III) sulfate is preferred. [2] It was also used in gelatine emulsions in photographic film as hardener. [4]
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Chromium tanning is the most popular tanning method as 90% of all leather in the world is processed this way. [13] Alligator hide is also tanned using the Chromium process. [ 14 ] A reason many tanneries choose to use chromium is due to the final leather product being more durable and stretchy, ideal for leather accessories and garments.
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