IntroductionUp until the beginning of the 19th century, paper was mainly made from old rags made of linen, hemp or cotton, but as the demand for paper grew, the art of paper making changed. Wood became the principal raw material for the manufacture of paper and the traditional gelatin sizing was replaced with alum-rosin sizing. Both internal and external factors contribute to the deterioration of paper and now millions of books worldwide are affected. ![]() http://www.kdla.net/pubrec/preslabbroch.htm |