Acid in poor quality paper causes the destruction of documents and photographs. Documents whould be written on acid free paper, and documents should be stored in acid-free containers. See archival qua [..]

Paper made in a neutral pH system, usually buffered with calcium carbonate. This increases the longevity of the paper.

A term describing paper and board that can be used with anything that may be tarnished or otherwise harmed by acid.

Paper and other materials with a pH of 7 (neutral) or higher (alkaline). Acid-free materials are often prescribed for use in the packaging of records to ensure their long-term preservation.

Paper made without acid in the pulp. Having acidic ingredients in the paper causes it to degrade more quickly.

pH neutral. The discoloration of paper derived from wood is caused by the interaction of lignin, (the gummy substance that binds the cellulose fibers together), acidity and sunlight. By buffing the pa [..]

Term “acid-free” is used to describe framing or matting materials that are chemically neutral.

(Neutral pH of 7.0) During paper production, treatment employed with a mild base is employed to neutralize the natural acids occurring in wood pulp.  Buffering may also be used to prevent the formatio [..]