Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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A condition or state in which the concentration of hydrogen ions in an aqueous solution exceeds that of hydroxyl ions. Acidity is probably the most important single factor affecting the permanence of archival materials. Acidity alone, however, does not necessarily connote destructiveness; the nature of the acid, i.e., the strength of its acidic properties, is of more importance than its quantity; e.g., a relatively small amount of sulfuric acid may have a greater destructive effect than a larger quantity of lactic acid. Because of this, both pH value and titration are necessary to achieve adequate evaluation of the potentially destructive effect of an acid. See also: HYDROGEN-ION CONCENTRATION . (144 )

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