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 .
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