This section is from the book "Cassell's Cyclopaedia Of Mechanics", by Paul N. Hasluck. Also available from Amazon: Cassell's Cyclopaedia Of Mechanics.
Below is given information on curing and dyeing sheepskins. The skins should first be fleshed, that is, freed by a sharp knife from any fat or flesh. They are then cured or tawed by placing in some preservative; a suitable one consists of 1 lb. of alum 1/4 lb. of salt, about i peck of bran, and 1 gal. of boiling water. This should be well mixed and covered for some time to allow the bran to swell. The skins are left in the preservative for a day or two, or until the tawing is completed, which may be known by a white line being left when a part of the skin is folded and pinched. The skins are now taken out, stretched on a frame or door and curried. This is done by scraping in every direction to remove the inner part of the skin. Or they may be curried and stretched after. They are now dried and the scraping continued, being supplemented by shaking and rubbing between the finger knuckles.
 
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