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 |