Research Article
Characterization and Digital Restauration of XIV-XV Centuries Written Parchments by Means of Nondestructive Techniques: Three Case Studies
Table 2
Assignment of the main ATR-FTIR bands of the three parchments.
| Wavenumber (cm−1) | Band assignments | Parch. 34 | Parch. 37 | Parch. 38 |
| 3523; 3394 | | | Gypsum (νOH) | 3294 | 3291 | 3291 | Collagen (Amide A) [4] | 3087 | 3076 | 3078 | Collagen (Amide B) [4] | 2932; 2854 | 2919; 2854 | 2924; 2854 | Collagen (νC–H) [4] | 1796 | | | ν1 + ν4 combination band of CO3= [31] | 1631 | 1631 | 1642 | Collagen (Amide I) [overlapping with δH–O–H (approx. 1610) of structural H2O] [4] | 1541 | 1548 | 1545 | Collagen (Amide II) | 1440 | 1430 | 1430 | δCH2 [4] | 1415 | 1413 | 1413 | δipC–O–H (carboxylic side chains), δNH2 [4], ν3 asymmetric of CO3= [3, 31] | 1333 | 1337 | 1323 | ωCH2/δC–H (methine) [4] | 1236 | 1240 | 1242 | Amide III [3] | | 1200 | 1200 | νC–O–C and δC–H [3] | | 1162 | 1162 | NH3 + residual modes [30] | 1140 (sh) | | | ν3 calcium sulphate [4] | 1113 | | | Gypsum (ν3 SO4=) [4] | 1080 (sh) | 1081 | 1081 | νC–O or skeletal ν [30] | 1034 | 1034 | 1034 | νC–N [30]or νC–O–C and νC–O [3] | 874 | 874 | 874 | ν2 asymmetric of CO3= [3, 25] | 711 (sh) | | | ν4 symmetric of CO3= | 670 | | 662 | Gypsum (δantis SO4=) | 602 | | 602 | Gypsum (ν4as SO4=) [4] |
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ν = stretching; δ = bending; d = deformation; ip = in-plane; sh = shoulder.
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