## 3 Results
### Reflectance Values at a Wavelength of 1700-2500 nm
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline
**Wavelength:** & & & & & & & & & & \\
**1700–2500 nm** & **Variable** & **Mean** & **Median** & **Min.** & **Max.** & **Q 25\%** & **Q 75\%** & **Standard** & **Shapiro–Wilk** \\ \hline Oil A before & A\_0 & 0.097 & 0.070 & 0.060 & 0.258 & 0.066 & 0.074 & 0.069 & \(p\) \(<\) 0.0001 \\ \hline Oil A after 20 min. & A\_20\_min & 0.090 & 0.064 & 0.059 & 0.246 & 0.062 & 0.067 & 0.065 & \(p\) \(<\) 0.0001 \\ \hline Oil A after 60 min. & A\_60\_min & 0.080 & 0.068 & 0.058 & 0.246 & 0.064 & 0.075 & 0.041 & \(p\) \(<\) 0.0001 \\ \hline Oil A after 120 min. & A\_120\_min & 0.087 & 0.071 & 0.066 & 0.238 & 0.069 & 0.095 & 0.038 & \(p\) \(=\) 0.0001 \\ \hline Oil B before & B\_0 & 0.098 & 0.070 & 0.062 & 0.269 & 0.066 & 0.079 & 0.069 & \(p\) \(<\) 0.0001 \\ \hline Oil B after 20 min. & B\_20\_min & 0.096 & 0.064 & 0.061 & 0.322 & 0.063 & 0.067 & 0.079 & \(p\) \(<\) 0.0001 \\ \hline Oil B after 60 min. & B\_60\_min & 0.082 & 0.068 & 0.062 & 0.249 & 0.065 & 0.077 & 0.041 & \(p\) \(<\) 0.0001 \\ \hline Oil B after 120 min. & B\_120\_min & 0.088 & 0.071 & 0.066 & 0.244 & 0.068 & 0.099 & 0.039 & \(p\) \(=\) 0.0001 \\ \hline Oil C before & C\_0 & 0.098 & 0.070 & 0.063 & 0.263 & 0.066 & 0.077 & 0.069 & \(p\) \(<\) 0.0001 \\ \hline Oil C after 20 min. & C\_20\_min & 0.094 & 0.066 & 0.058 & 0.271 & 0.064 & 0.069 & 0.070 & \(p\) \(<\) 0.0001 \\ \hline Oil C after 60 min. & C\_60\_min & 0.085 & 0.071 & 0.063 & 0.246 & 0.067 & 0.089 & 0.041 & \(p\) \(<\) 0.0001 \\ \hline Oil C after 120 min. & C\_120\_min & 0.089 & 0.074 & 0.064 & 0.247 & 0.069 & 0.1001 & 0.040 & \(p\) \(=\) 0.0001 \\ \hline Oil D before & D\_0 & 0.096 & 0.068 & 0.062 & 0.261 & 0.066 & 0.073 & 0.070 & \(p\) \(<\) 0.0001 \\ \hline Oil D after 20 min. & D\_20\_min & 0.094 & 0.067 & 0.060 & 0.256 & 0.065 & 0.069 & 0.067 & \(p\) \(<\) 0.0001 \\ \hline Oil D after 60 min. & D\_60\_min & 0.083 & 0.071 & 0.061 & 0.245 & 0.066 & 0.079 & 0.040 & \(p\) \(<\) 0.0001 \\ \hline Oil D after 120 min. & D\_120\_min & 0.088 & 0.074 & 0.063 & 0.246 & 0.068 & 0.102 & 0.040 & \(p\) \(=\) 0.0001 \\ \hline \hline \end{tabular}
\end{table} 
Table 13: Selected descriptive statistics of the reflectance value at a wavelength of 1700–2500 nm, along with a statistical assessment of the normality of distribution. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Oil A:** **Conover–**Iman post hoc test; \(p\) =** \\ \hline
**Intertemporal comparison** & **A 0** & **A\_20 min** & **A\_60 min** & **A\_120 min** \\ \hline
**A\_0** & 0.000 & 0.000 & 0.0064 & 0.3357 \\ \hline
**A\_20\_min** & 0.0000 & 0.0398 & \textless{}0.0001 \\ \hline
**A\_60\_min** & 0.0064 & 0.0398 & \textless{}0.0004 \\ \hline
**A\_120\_min** & 0.3357 & \textless{}0.0001 & 0.0004 \\ \hline
**Oil B:** **Conover–Iman post hoc test; \(p\) =** \\ \hline
**Intertemporal comparison** & **B\_0** & **B\_20\_min** & **B\_60\_min** & **B\_120\_min** \\ \hline
**B\_0** & 0.0001 & 0.0184 & 0.6607 \\ \hline
**B\_60\_min** & 0.0184 & 0.0829 & \textless{}0.00058 \\ \hline
**B\_120\_min** & 0.6607 & \textless{}0.0001 & 0.0058 \\ \hline
**Oil C:** **Conover–Iman post hoc test; \(p\) =** \\ \hline
**Intertemporal comparison** & **C\_0** & **C\_20\_min** & **C\_60\_min** & **C\_120\_min** \\ \hline
**C\_0** & 0.0002 & 0.2120 & 0.3030 \\ \hline
**C\_20\_min** & 0.0002 & 0.0098 & \textless{}0.0001 \\ \hline
**C\_60\_min** & 0.2120 & 0.0098 & \textless{}0.0250 \\ \hline
**C\_120\_min** & 0.3030 & 0.0000 & 0.0250 \\ \hline
**Oil D:** **Conover–Iman post hoc test; \(p\) =** \\ \hline
**Intertemporal comparison** & **D\_0** & **D\_20\_min** & **D\_60\_min** & **D\_120\_min** \\ \hline
**D\_0** & 0.1096 & 0.4015 & 0.5182 \\ \hline
**D\_20\_min** & 0.1096 & 0.4385 & 0.0266 \\ \hline
**D\_60\_min** & 0.4015 & 0.4385 & 0.1403 \\ \hline
**D\_120\_min** & 0.5182 & 0.0266 & 0.1403 \\ \hline \hline \end{tabular}
\end{table}