Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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The property or condition of a material, such as, paper, board. adhesives etc, that causes failure of the material when it is deformed by bending. As virtually any material will fail if bent or folded a sufficient number of times, brittleness is of practical interest only when deformation producing failure is small or the number of folds is relatively small in number.

Over the course of many years. high acidity in paper, and particularly acidity resulting from inorganic acids of low volatility has been suspected of being the chief cause of brittleness in paper. This acidity can be attributed to several sources: 1) papermaking procedures, e.g., excessive ALUM in sizing or excessive chlorine in BLEACHING (1) , which may lead to the formation of acid; 2) ink; and 3) conditions of storage, which may allow acid gases such as SULFUR DIOXIDE to gain access to the paper, which. in the presence of heat and other conditions. may lead to the formation of acid. See also: ACID ;ACID GASES ;ACIDITY ;ACID SIZE ;DEACIDIFICATION ;DURABILITY (OF PAPER) ; FOLDING ENDURANCE .

(17 , 34 , 41 , 348 )

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