You can tell whether a book or a newspaper is new from its color, as they all tend to turn a bit yellow over time. The reason why this happens involves both history and the chemistry of paper. Simon Whistler of Today I Found Out is happy to tell us all about it.
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Simple, wood pulp paper turns yellow and brown. Cotton paper, also known as rag paper, is made using cotton linters or cotton from used cloth (rags) as the primary material. ... Cotton paper is superior in both strength and durability to wood pulp-based paper, which may contain high concentrations of acids, and also absorbs ink or toner better.
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