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

Table 6

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

Experimental wavenumbers (cm^-1)		Band assignment
Mastic	Dammar
3500	3500	νOH
2988	2978	CH3/CH2
2880	2880	CH3
1737	1731	νC=O (ketones, esters, lactones)
1715	1715	νC=O (acids)
1475	1475	δCH3/CH2
1392	1392	δCH3
1270	1270	C-O
1207	1207	C-O
1116	1116	C-O
1085	1094	C-O
1050	1055	C-O
	896	δH2C=C