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

Table 5

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

Experimental wavenumbers (cm^-1)				Band assignment
Sandarac	Manila copal	Colophony	Venetian turpentine
3085	3085			νHC=C
2985	2985	2985	2985	CH3/ CH2
2880	2880	2880	2880	CH3
2857	2857			CH2
1720	1730	1730	1718	νC=O
1650	1650			νC=C
1475	1475	1475	1475	δCH2
1455	1455	1455		CH3
1395	1395	1395	1395	CH3
1280	1280	1290	1290	C-O
1190	1190	1190	1190	C-O
1050	1050	1050	1050	C-O
900	900			δH2C=C