Modelling clay materials used in artworks: an infrared spectroscopic investigation

Heritage Science

Table 1 Major infrared band assignments for modelling clay samples from Dwyer artworks

Wavenumber/cm⁻¹	Band assignments	References
712	CaCO₃ C–O bending	[6,7,8,9]
717, 728	Paraffin C–H rocking	[10, 11, 13, 14]
849, 872	CaCO₃ C–O bending	[6,7,8,9]
1030	Oxidation products C–O stretching	[17, 23]
1190	Oxidation products C–C stretching	[17, 23]
1367, 1378	Paraffin C–H bending	[10, 11, 13, 14]
1414	CaCO₃ C–O stretching	[6,7,8,9]
1463, 1470	Paraffin C–H bending	[10, 11, 13, 14]
1720, 1730	Oxidation products C=O stretching	[16,17,18]
1790	CaCO₃ C=O stretching	[6,7,8,9]
2520	CaCO₃ overtone/combination band	[7, 8]
2847, 2874, 2916, 2950	Paraffin C–H stretching	[10, 11, 13, 14]