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Table 1 Acidic (pH ≤ 6) and non-acidic (pH > 6) books measured (sample size), percentages, and corresponding total number of books of the NC collection in each stratum of age

From: Non-destructive collection survey of the historical Classense Library. Part II: Conservation scenarios

NC Stratum NC collection
Acidic Non-acidic
Sample size % of books No of books Sample size % of books No of books
1501–1550 1 8 103 11 92 1132
1551–1600 2 17 499 10 83 2497
1601–1650 6 50 640 6 50 640
1651–1700 3 25 293 9 75 878
1701–1750 2 17 431 10 83 2155
1751–1800 1 8 314 11 92 3453
1801–1850 2 17 706 10 83 3529
1851–1900 11 61 5787 7 39 3683
1901–1950 48 96 26,430 2 4 1101
Total 76 65 35,203 76 35 19,068