The ageing of model pigment/linseed oil systems studied by means of vibrational spectroscopies and chemometrics

Lastly, we exploited the potentiality of Principal Component Analysis (PCA) on the combined FT-NIR and Raman spectra in order to define a possible ageing trend for two oil-white mixtures. Furthermore, we tested the statistical models by comparison with spectra related to the two ten-year-old mock-ups.