What is acid paper ?
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Blue litmus paper
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A type of paper that is slightly acidic. Most paper is acid paper, since it is produced using bleaching agents, sizing materials (in particular, acid-rosin sizing, which is the chemical that, although useful for imparting water resistance to paper, is also responsible for rapid aging, yellowing, and deteriorating), and coatings that impart to the paper a degree of acidity.
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