Book leather is a type of leather that is used to cover books and other items. It is made from the hides of animals, usually cows, and is tanned and dyed to give it a unique look. The term 'roan' is used to describe the color of book leather, which is usually a reddish-brown hue. Roan is derived from the Old English word 'hrōan, ' which means 'RED.' Book leather is often used for bookbinding, as it is durable and can protect the pages of a book from wear and tear.