Often invisible but important

To make a book durable and functional, other technical cloths and papers are used. They might be used to re-inforce a book, to give a book case a ''soft'' touch or maybe a special decoration. Hinges and re-inforcements are often made of these products, and they are also used to restore and repair books. There is a wide range of applications for technical materials. In most cases, these materials are barely visible, but are nevertheless a substantial part of a book.