If you are looking for acid free archival paper for printing photographs, art, drawings, and heirloom books, we now offer a few choices. Many of the inkjet art and photo papers we offer from Innova and Kodak were manufactured to conform to ISO Standards (11108 and 9706). These standards establish specific criteria that must be met in order for papers to last hundreds of years in libraries and archives. According to ISO Standard 11108, a museum-grade, acid free archival paper must have a pH value between 7.5 and 10 and an alkalai reserve of at least 2% calcium carbonate.
The paper must also be made from cotton, withstand breakage from folding, resist tearing, and be free of easily oxidized materials such as lignins. A lignin is an acidic substance in the cell walls of plant fibers that can contribute to the yellowing of papers. Lignins are more highly concentrated in wood pulps (such as those used to make newsprint) than in cotton rag papers. Alpha-cellulose archival papers are made from a high-grade wood pulp that is acid- and lignin-free.