Mid and Near-Infrared Reflection Spectral Database of Natural Organic Materials in the Cultural Heritage Field

Table 1

Experimental wavenumber values corresponding to the maxima of the mid-IR total reflection mode bands of proteinaceous materials and their tentative assignment.

Experimental wavenumbers (cm^-1)	Band assignment
Casein and animal glues
3570	νOH
3370	NH
3095	Overtone of combination band δNH and νCN (amide II)
2985	CH3
2945	CH2
2885	CH3
2855	CH2
1698	νC=O (amide I)
1578	Combination band δNH and νCN (amide II)
1470	δCH (amide III)
1400-1300	δCH
1300-1000	C-O (COO^-)