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Table 4 Major infrared band assignments for modelling clay samples from Boonma artwork

From: Modelling clay materials used in artworks: an infrared spectroscopic investigation

Wavenumber/cm−1 Band assignments References
712 CaCO3 C–O bending [6,7,8,9]
718, 729 Paraffin C–H rocking [10, 11, 13, 14]
849, 876 CaCO3 C–O bending [6,7,8,9]
700–950 Kaolinite O–H bending, Si–O stretching [21, 26]
800–1200 Kaolinite Si–O stretching [21, 26]
1000–1300 Oxidation products C–O and C–C stretching [17, 23]
1378 Paraffin C–H bending [10, 11, 13, 14]
1420 CaCO3 C–O stretching [6,7,8,9]
1461, 1472 Paraffin C–H bending [10, 11, 13, 14]
1600–1700 Water O–H bending [23]
Oxidation products C=O stretching [16,17,18, 23]
1785 CaCO3 C=O stretching [6,7,8,9]
2525 CaCO3 overtone/combination band [7, 8]
2848, 2880, 2915, 2951 Paraffin C–H stretching [10, 11, 13, 14]
3100–3600 Water O–H stretching [23]
oxidation products O–H stretching [23]
3624, 3638, 3688 Kaolinite O–H stretching [21, 26]