Archival Methods 100% Cotton Museum Board, 11x14", 2 Ply, Bright White, Package of 25 100% cotton fiber Processed with artesian well water - pollutant and alkaline-free Acid and lignin-free (Lignin content is tested by TAPPI 236 cm-85 and has a Kappa number of less than five) Calcium carbonate buffer maintains proper pH levels and protects against airborne pollutants (2-3% alkaline reserve, pH 9 +/-0.5, acid-free) Pulp-free - Contains no metal particles, waxes, plasticizers or residual bleach peroxides