The application of FTIR microspectroscopy in a non-invasive and non-destructive way to the study and conservation of mineralised excavated textiles

Heritage Science

Table 2 Shifts in band assignments for the proteinaceous reference samples as detected by the application of FTIR at different modes

Band assignment	Wavenumber (cm⁻¹) FTIR-ATR, literature	Wavenumber (cm⁻¹) FTIR transmission	Wavenumber (cm⁻¹) FTIR reflectance
ν(N–H) amide bond	3275	3325	3325
ν(C=O) amide I bond	1615	1690	1720
δ(N–H) amide II bond	1515	1528	1541
ν(C–N) amide III bond	1235	1235	1248 (silk), 1260 (wool)