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Table 3 Major infrared band assignments for modelling clay samples from Hinder artworks

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

Wavenumber/cm−1 Band assignments References
595 Gypsum S–O bending [19, 20]
664 Gypsum S–O stretching [19, 20]
711 CaCO3 C–O bending [6,7,8,9]
728 Paraffin C–H rocking [10, 11, 13, 14]
766 Goethite O–H bending [21, 22]
852, 872 CaCO3 C–O bending [6,7,8,9]
1000–1300 Oxidation products C–O and C–C stretching [17, 23]
Gypsum S–O stretching [19, 20]
1385 Paraffin C–H bending [10, 11, 13, 14]
1413 CaCO3 C–O stretching [6,7,8,9]
1456 Paraffin C–H bending [10, 11, 13, 14]
1550–1750 Water O–H bending [23]
Gypsum O–H bending [19, 20]
Oxidation products C=O stretching [16,17,18, 23]
1790 CaCO3 C=O stretching [6,7,8,9]
2522 CaCO3 overtone/combination band [7, 8]
2725 Aldehyde O=C–H stretching [23]
2848, 2865, 2917, 2948 Paraffin C–H stretching [10, 11, 13, 14]
3100–3700 Water O–H stretching [17, 23]
Oxidation products O–H stretching [23]
Gypsum O–H stretching [19, 20]
Goethite O–H stretching [21, 22]