An acid-free paper with good aging properties. The ANSI Z39 USA Permanent Paper Standard specifies that permanent machine made papers be composed of rag fibers or chemical wood pulp with a pH of 7.5 or greater and an alkaline reserve.
See acid-free paper.
Sources Checked for Data in Record
- Book and Paper Group, Book and Paper Group, Paper Conservation Catalog, AIC, 1984, 1989
- Silvie Turner, Silvie Turner, Which Paper?, Design Press, New York, 1991