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A classification of paper in which the paper has an alkaline base rather than an acid base because of the lack of acidic ingredients in its composition. The paper is manufactured with fillers such as calcium carbonate, which bring the pH above 7, providing an alkaline base. Paper with an alkaline base became more available in the last half of the 20th Century and is now quite common. Since the 1970's, most of the paper used for book publishing and other printed materials in which permanence is of importance, has been produced with an alkaline base. Alkaline-based paper is much more stable than acid-based paper and is better suited for long-term preservation of printed documents.
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