We list the specifications for our archival products right with the product, so you know exactly what you're getting.
Acid-Free – Having a pH of 7.0 or greater at the time of manufacture.
Lignin-Free – Must test negative for lignin, a component of plant cells believed to aid chemical degradation.
pH – The pH of the paper material at the time of manufacture; 7 is neutral; 0 to 6.9 is acidic, 7.1 to 14 is alkaline. Papers and boards usually test within a pH range. Plastics are not described by pH.
Construction – The thickness and type of material; pt. and mil are both terms that indicate 1/1,000 of an inch.
Color – Our colors won't bleed.
Buffer – This line indicates whether or not an alkaline substance has been added to neutralize acids or counteract acids in the future; some items may be sensitive to alkalinity and require unbuffered materials.
The Photographic Activity Test (P.A.T.) is a simulated aging test developed by the Image Permanence Institute to predict which storage materials will cause accelerated deterioration or staining in photos, a very sensitive medium. Most of our storage materials have been submitted and passed the test. The absence of the logo does not indicate that a product has failed the P.A.T., as some products have not yet been tested.