The amount of acid contained in paper. The acidity is measured by a pH factor from 0 to 14. The neutral point being 7, 0 to 7 is acid and 7 to 14 is alkaline.
The amount of acid contained in paper. The acidity is measured by a pH factor from 0 to 14. The neutral point being 7, 0 to 7 is acid and 7 to 14 is alkaline.
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