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Acid-Free - the acidity occurring in most papers causes a slow deterioration of both the paper itself, and often, the images (such as photos or lithographs) mounted or printed upon them. This aging process is slowed significantly when special precautions are taken during the manufacturing process. Theoretically, in the manufacturing process of "acid-free paper," volatile acids are neutralized in the pulp, bringing the finished product to a pH level of "7", considered "neutral". After the papermaking process, acid may re-enter the paper often as a result of environmental exposure to a harmful substance such as sulfur dioxide often found in the atmosphere. If the paper is remain acid-free, it is often necessary to add a buffer, or reserve, of an alkaline substance to the paper during the manufacturing process for the purpose of counteracting any acid which may be introduced into it in the future.
Acid-free paper is commonly used by artists, printers, and publishers who wish to extend the life of materials used for fine art, limited-edition printing, and permanent records where contact with the print or document could be harmful. Consideration of a paper's acidity is an important factor when doing archival work. When controlled from the beginning, working with acid-free paper helps preserve the product, and it's value, considerably.
see also: acid free and lignin free
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