What is permanent paper?
Permanent paper is defined by the National Information Standards Organization (NISO) in ANSI/NISO Z39.48-1992 (R2009), Permanence of Paper for Publications and Documents in Libraries and Archives (PDF), which specifies a 2% minimum alkaline reserve, less than 1% lignin, good tear resistance, and a pH range between 7.5 to 10.0.
The U.S. Federal Government uses permanent paper for federal records, books, and publications of enduring value.
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