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

Table 7

Experimental wavenumber values corresponding to the maxima of the mid-IR total reflection mode bands of not (exclusively) terpenoid-based resins and their tentative assignment.

Experimental wavenumbers (cm^-1)	Band assignment
Shellac
3570	νOH
2970	CH
2873	CH
1747	νC=O
1470	In-plane δCH2
1385	CH3
1273	νC-O
1180	νC-O
1120	νC-O
1095	νC-O
1075	νC-O
1055	νC-O
1015	νC-O
1030	νC-O
950-930
733	νC-C
Dragon’s blood
3500	νOH
3030	νCH (aromatic, olefinic)
2963	CH
2855	CH
1665	νC=C, νC=O
1623	νC=C (aromatic)
1520	νC=C (aromatic)
1473	νC=C (aromatic)
1300
1255	νC-O
1218	νC-O
1178	νC-O
1164	νC-O
1123	νC-O
1052	In-plane δCH (aromatic)
960	Out-of-plane δCH (aromatic, olefinic)
885	Out-of-plane δCH (aromatic, olefinic)
850	Out-of-plane δCH (aromatic, olefinic)