# Comparative Studies on Nanocellulose as a Bio-Based Consolidating Agent for Ancient Wood
## 3 Results and Discussion
### Characterization of Treated Degraded Wood Samples
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline  & & \multicolumn{2}{c}{**L\({}^{*}\) (D65)**} & \multicolumn{2}{c}{**a\({}^{*}\) (D65)**} & \multicolumn{2}{c}{**b\({}^{*}\) (D65)**} & & & \\ \hline \multirow{2}{*}{**NT**} & SCI & 64.82 & 9.30 & 24.03 & \(\Delta\)L & \(\Delta\)C & \(\Delta\)E \\ \cline{2-8}  & SCE & 64.71 & 9.34 & 24.12 & SCI & \(-\)13.58 & 6.68 & 15.14 \\ \hline \multirow{2}{*}{** Paraloid B72 TR**} & SCI & 51.24 & 14.07 & 28.71 & SCE & \(-\)13.74 & 6.81 & 15.34 \\ \cline{2-8}  & SCE & 50.97 & 14.17 & 28.92 & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Comparison of the colorimetric parameters (L\({}^{*}\), a\({}^{*}\), b\({}^{*}\)) of the untreated sample (NT) and the samples treated with Paraloid B-72. Figure 6: Reflectance spectra of untreated (NT) and treated samples (CNC, Paraloid B-72, Regalrez 1126), acquired in SCI and SCE mode 24 h after the consolidation treatment. In this graph, the green curves, corresponding to the samples treated with CNC, are very close to the curves referring to the untreated sample (orange curves); this is because the results obtained from the NT and CNC samples were very similar, as seen previously. On the contrary, the samples treated with Paraloid B-72 (pink curves) and Regalrez 1126 (blue curves) had very similar curves, in some points even overlapping, but distant from the descriptive curve of the untreated sample; in fact, the results obtained from these samples showed a significant chromatic change compared to the untreated wood. The same colorimetric measurements were carried out on the same samples one month after the previous ones; the results obtained are shown in Tables 5-7. Moreover, a comparison between the previous colorimetric data and those acquired a month later from the same samples exhibited only small variations in \(\Delta\)L, \(\Delta\)C, and \(\Delta\)E in all cases (Tables 8-11). As it is possible to observe in the corresponding graph (Figure 7), after one month, the samples treated with CNC did not change their color, but remained very close in colorimetric aspect to the untreated samples; on the contrary, the samples treated with Paraloid B-72 and Regalrez 1126 changed color, making the wood darker. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline  & & **L\({}^{*}\) (D65)** & **a\({}^{*}\) (D65)** & **b\({}^{*}\) (D65)** & & & & \\ \hline \multirow{3}{*}{**NT POST**} & SCI & 63.06 & 9.41 & 23.30 & \(\Delta\)**L** & \(\Delta\)**C** & \(\Delta\)**E** \\ \cline{2-9}  & SCI & 63.06 & 9.41 & 23.30 & SCI & \(-\)11.18 & 4.62 & 12.10 \\ \hline \multirow{3}{*}{** Paraloid B72 POST**} & SCI & 51.88 & 12.96 & 26.25 & SCE & \(-\)11.29 & 4.66 & 12.21 \\ \cline{2-9}  & SCE & 51.70 & 13.01 & 26.36 & & & & \\ \hline \end{tabular}
\end{table} 
Table 6: Comparison of the colorimetric parameters (L\({}^{*}\), a\({}^{*}\), b\({}^{*}\)) of the untreated sample (NT) and the samples treated with Paraloid B-72, obtained from the colorimetric analysis carried out one month after the treatment. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline  & & **L\({}^{*}\) (D65)** & **a\({}^{*}\) (D65)** & **b\({}^{*}\) (D65)** & & & & \\ \hline \multirow{3}{*}{**NT POST**} & SCI & 63.06 & 9.41 & 23.30 & \(\Delta\)**L** & \(\Delta\)**C** & \(\Delta\)**E** \\ \cline{2-9}  & SCI & 63.06 & 9.41 & 23.38 & SCI & \(-\)10.66 & 4.92 & 11.74 \\ \hline \multirow{3}{*}{**Regalrez 1126**} & SCI & 52.40 & 12.99 & 26.68 & SCE & \(-\)10.69 & 4.94 & 11.78 \\ \cline{2-9}  & SCE & 52.30 & 13.03 & 26.75 & & & & \\ \hline \end{tabular}
\end{table} 
Table 7: Comparison of the colorimetric parameters (L\({}^{*}\), a\({}^{*}\), b\({}^{*}\)) of the untreated sample (NT) and the samples treated with Regalrez 1126, obtained from the colorimetric analysis carried out one month after the treatment.