Table 1 TWEL values (in years) in relation with T and RH values surrounding Ancient and Modern collections obtained for various paper types by combining values of acidity (pH) and initial degree of polymerisation (DP0)
TWEL | pH | DP0 | ||
|---|---|---|---|---|
Low (600) | Fair (1500) | Good (2000) | ||
Ancient collection | Acidic (5) | 219 | 677 | 1188 |
Neutral (7) | 351 | 1083 | 1902 | |
Basic (8) | 373 | 1151 | 2021 | |
Modern collection | Acidic (5) | 204 | 631 | 1107 |
Neutral (7) | 327 | 1009 | 1772 | |
Basic (8) | 348 | 1072 | 1882 | |