## 3 Results and Discussions
### Dating the Label by Glycolysis Rate
** & **New** & **Old** \\ \hline \(w\)(OH) & 3450 & - & - & 3443 & 3455.64 & 3449.86 \\ \hline \(w\)(CH) in CH\({}_{2}\)-CRR & - & & 3075 & - & - \\ \hline \(w\)(CH) in CH\({}_{2}\) & 2926 & - & - & 2935 & 2943.67 & 2903.31 \\ \hline \(w\)(CH) in CH\({}_{3}\)CH & - & - & - & 2870 & 2878.89 & - \\ \hline \(w\)(CH) in CH\({}_{2}\) & 2852 Significant differences between the three spectral bands could be observed, especially by analyzing peaks in the wavelength range between 1850 and 675 cm\({}^{-1}\). Thus, a wide peak between 1100 and 1200 cm\({}^{-1}\) was observed due to the overlapping of the two deformation bands of C-O groups from boiled linseed oil at 1083.19 cm\({}^{-1}\) (new varnish) and 1090.48 cm\({}^{-1}\) (old varnish) and 1123.72 cm\({}^{-1}\) (new varnish) and 1122.46 cm\({}^{-1}\) (old varnish), respectively, and colophony at 1166.92 cm\({}^{-1}\) (new varnish) and 1172.84 cm\({}^{-1}\) (old varnish), which became less symmetrical at the old varnish. There were also differences in COH connections, which had a deformation peak representative of colophony at 897.70 cm\({}^{-1}\) (old varnish) and 895.47 cm\({}^{-1}\) (new varnish) and for C=C at 725.89 cm\({}^{-1}\) (new varnish) and 740.57 cm\({}^{-1}\) (old varnish). Of the two functional groups, the deformation vibrations of the COH connections were well differentiated, whereas in contrast, those of the C=C connections (carbon skeleton) were insignificant. FTIR spectra suggested that boiled flax oil over time had an activating role in the oxidation reactions of colophony components, and colophony had a role in reducing cross-linking by polymerizing linseed oil at siccativation, and that the varnish conservation state was related to the composition of the two components, but also by the presence of other additives used to obtain it (especially the presence of the cations of the \"s\" blocks of metals, which led to the saponification of the active carboxylic groups). In fact, the concentration and distribution of colophony affected oil oxidation and vice versa. From the literature [34; 35; 36; 37], it is well known that there were peaks of the valence vibrations of the carbonyl group in the isocaturated boiled linseed oil of 1738.30 cm\({}^{-1}\) (the new varnish) and 1733.09 cm\({}^{-1}\) (the old varnish), respectively, of the vinyl from colophony groups from 1662.96 cm\({}^{-1}\) (new varnish) and from 1657.46 cm\({}^{-1}\) (old varnish), both with the same displacement effect (the peaks modifying their asymmetry in the old varnish). On the other hand, the old varnish, due to the oxidative fouling of the boiled linseed oil from the surface, protected the inner area of the film, which was visible on the deformation vibrations of the COH bond, from 811.50 cm\({}^{-1}\), which was found only at the new varnish, and colophony from 897.70 cm\({}^{-1}\) for the old varnish and 895.47 cm\({}^{-1}\) for the new varnish. The IR spectra highlighted, based on the functional groups of major chemical components, the presence of boiled linseed oil and colophony (triterpenic resins) in the varnish. For these two examined areas, slight displacements of the absorption bands were observed in relation to those presented in the literature. The peaks of the old varnish were obviously much weaker than those of the new varnish, and the different peak values indicated different states of degradation of the two varnishes, with a difference of 100 years between them. The difference between the conservation states of the two varnishes was given by the decrease of the peak intensities of the C-H group from the colophony from 2943.67 cm\({}^{-1}\) (new varnish) with its displacement at 2903.31 cm\({}^{-1}\) (old varnish) and, respectively, 2878.89 cm\({}^{-1}\) (new varnish) at 2753.15 cm\({}^{-1}\) (old varnish) and that of the C=C group at 1657.45 cm\({}^{-1}\) (old varnish), which was attenuated and slightly displaced from 1662.95 cm\({}^{-1}\) (new varnish), which was well-defined.