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Table 1 Possible assignment of the FTIR peaks of spectrum in Fig. 6

From: Microscopic observations of paper and parchment: the archaeology of small objects

Wavenumber [cm−1]

Group vibration

Compound responsible for vibration

3726; 3700

Free OH stretching

Inorganic compound (iron clay)

3409

OH bonded

Parchment, saponins, castor oil

2925, 2856

CH3, CH2 stretching

Parchment, saponins, castor oil

1718

C=O stretching

Saponins

1664

Amide I β sheet

Parchment

1636

Amide I α sheet

Parchment

1556

NH bend coupled with CN stretching

Parchment

1444, 1407, 1382

Scissoring of, O–C–H, C–C–H, CH2, C–OH, CH2 wagging, bending C–H

Parchment, saponins, castor oil

1328

Amide III

Parchment

1238

NH bending Amide III, C(O)–O stretching

Parchment, castor oil

1199

C–H bending

Parchment

1148

OH bending

Parchment, saponins, castor oil

1093, 1036

C–O stretching

Parchment, saponins, castor oil

674, 609, 535, 472

Not attributed

Skeletal vibration and inorganic compound related to free OH stretching