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Acid-free paper
Acid-free paper is paper that has a neutral or basic pH (7 or greater), although paper having a pH between 6 and 7 is often also considered acid-free. During production, it is treated with a mild base (usually calcium or magnesium bicarbonate) to neutralize the natural acids occurring in wood pulp, and it may also be buffered to prevent the formation of additional acids (as may develop from the application of sizing).
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