Multivariate analysis of combined reflectance FT-NIR and micro-Raman spectra on oil-paint models

Moreover, we verified that after a natural ageing of 9 months, and in presence of a pigment, it is still possible to obtain information regarding the functional groups directly involved in the drying process (e.g., the 1st overtones of methylenic stretching, 5800 cm− 1 and 5698 cm− 1, the C-H combination bands of methylenic stretching and bending modes, 4340 and 4261 cm− 1, and the ν(C = C) stretching, 1654 cm− 1).