Acid-free paper
Acid-free paper is also known as archival paper. Documents with great historical value or significance with regard to government, studies, and/or great works of art are often printed on acid-free archival paper so that it can last for centuries. This paper is highly durable and, because it is acid free, it will not become hard or brittle with age. It will not discolor or run the risk of crumbling into dust.