When tanned in the ordinary way, pigskin as a leather for binding, is intractable and, though very tough, liable to get brittle for lack of grease. When tawed with alum, it is much more tractable and very durable. It doesn't lend itself to decoration, except in blind.
French: Peau de truie
Italian: Pelle di troia, di scrofa
Spanish: Piel de cerdo