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Table 1 Aspects and levels of degradation of the documents used for assessment of fitness

From: Damage function for historic paper. Part I: Fitness for use

Level Aspect of degradation
Tears Missing piece Discolouration (±SD, N = 5)
0 None None As acquired: L* = 97.3 ± 0.2, a* = −5.0 ± 0.7, b* = 12.6 ± 1.5
1 In the margin, not extending across the text In a corner, not extending across the text E 1976  = 21 ± 6, L* = 83 ± 5, a* = 0 ± 2, b* = 27 ± 4
2 Extending across the text ~1/3 into the page Extending across the text, ~1/6 of the page missing E 1976  = 36 ± 7, L* = 72 ± 8, a* = 5 ± 2, b* = 35 ± 2
  1. Total colour difference is relative to level 0