Vibrational Spectroscopies and Chemometry for Nondestructive Identification and Differentiation of Painting Binders

Figure 7

PCA applied to combined FT-NIR and Raman spectra, taking into account all neat binding media: score plot of PC2-PC4 (a) and loading plot of PC4 (b), highlighting proteinaceous and polysaccharide contributions.

(a)

(b)