Q: What is acid and lignin-free?
A: Acid-free paper is paper that has a neutral or basic pH (7 or greater), although paper having a pH between 6 and 7 is often also considered acid-free. During production, it is treated with a mild base to neutralize the natural acids occurring in wood pulp, and it may also be buffered to prevent the formation of additional acids (as may develop from the application of sizing.) Acid-free paper is often used in books and other paper products intended to last for a long time. Paper that has not had its acidity neutralized such as newsprint quickly yellows and deteriorates. Lignin makes up about one-quarter to one-third of the dry mass of wood and is an integral part of the cell walls. Cheaper papers (such as newsprint) have a high lignin content which causes the paper to discolor over time. This is a result of the lignin causing acid to reform within the paper fibers. Lignin can be removed during the manufacturing process to ensure that the scrapbooking paper remains acid-free for a long time. From Wikipedia, the free encyclopedia |