Materials that have a pH balance of 7.0 or higher. Many papers are considered acid free immediately after manufacture however unless they have been buffered, i.e. treated with a neutralising agent, chemical reactions with substances such as sizing or bleaching will cause the paper to become acidic over time. All plastic by its nature is acid free h...
Acid free refers to papers without acid (pH) in the pulp when manufactured. High acidity papers degrade quickly.
Acid free refers to papers without acid (ph) in the pulp when manufactured. High acidity papers degr
Specially prepared mounting boards, album pages, tissues, and storage boxes designed to house prints for maximum archival permanence. 
Acid free refers to papers without acid (pH) in the pulp when manufactured. High acidity papers degrade quickly