Table 2 Average pH and DP0 values for the groups of acidic and non-acidic books for the C and NC collection

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

 

C collection

NC collection

Non-acidic

Acidica

Non-acidic

Acidic

Average pH

6.8

5

6.4

5.4

Average DP0

1550

600

1640

1350

Proportion (%)

28

72

35

65

  1. aBooks with iron gall ink considered as acidic books
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