Heritage Science

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

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