## 3 Results
### Reflectance Values at a Wavelength of 590-720 nm
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline
**Wavelength:** & & & & & & & & & \\
**590–720 nm** & **Variable** & **Mean** & **Median** & **Min.** & **Max.** & **Q 25\%** & **Q 75\%** & **Standard** & **Shapiro–Wilk** \\ \hline Oil A before & A\_0 & 0.631 & 0.564 & 0.483 & 1.072 & 0.544 & 0.601 & 0.182 & \(p<0.0001\) \\ \hline Oil A after 20 min. & A\_20\_min & 0.611 & 0.568 & 0.482 & 0.978 & 0.542 & 0.604 & 0.138 & \(p<0.0001\) \\ \hline Oil A after 60 min. & A\_60\_min & 0.584 & 0.566 & 0.482 & 0.866 & 0.550 & 0.589 & 0.077 & \(p<0.0001\) \\ \hline Oil A after 120 min. & A\_120\_min & 0.588 & 0.563 & 0.479 & 0.897 & 0.549 & 0.619 & 0.087 & \(p=0.0001\) \\ \hline Oil B before & B\_0 & 0.633 & 0.560 & 0.508 & 1.054 & 0.548 & 0.607 & 0.178 & \(p<0.0001\) \\ \hline Oil B after 20 min. & B\_20\_min & 0.620 & 0.564 & 0.504 & 1.059 & 0.545 & 0.602 & 0.157 & \(p<0.0001\) \\ \hline Oil B after 60 min. & B\_60\_min & 0.589 & 0.560 & 0.508 & 0.897 & 0.550 & 0.603 & 0.081 & \(p<0.0001\) \\ \hline Oil B after 120 min. & B\_120\_min & 0.597 & 0.576 & 0.514 & 0.899 & 0.554 & 0.626 & 0.082 & \(p=0.0001\) \\ \hline Oil C before & C\_0 & 0.630 & 0.562 & 0.512 & 1.064 & 0.542 & 0.586 & 0.186 & \(p<0.0001\) \\ \hline Oil C after 20 min. & C\_20\_min & 0.618 & 0.557 & 0.511 & 1.045 & 0.537 & 0.595 & 0.159 & \(p<0.0001\) \\ \hline Oil C after 60 min. & C\_60\_min & 0.585 & 0.566 & 0.507 & 0.888 & 0.550 & 0.577 & 0.079 & \(p<0.0001\) \\ \hline Oil C after 120 min. & C\_120\_min & 0.594 & 0.567 & 0.515 & 0.928 & 0.555 & 0.614 & 0.088 & \(p=0.0001\) \\ \hline Oil D before & D\_0 & 0.631 & 0.571 & 0.495 & 1.055 & 0.539 & 0.600 & 0.182 & \(p<0.0001\) \\ \hline Oil D after 20 min. & D\_20\_min & 0.615 & 0.570 & 0.493 & 1.002 & 0.549 & 0.598 & 0.144 & \(p<0.0001\) \\ \hline Oil D after 60 min. & D\_60\_min & 0.582 & 0.561 & 0.497 & 0.860 & 0.548 & 0.591 & 0.076 & \(p<0.0001\) \\ \hline Oil D after 120 min. & D\_120\_min & 0.593 & 0.574 & 0.502 & 0.894 & 0.560 & 0.616 & 0.083 & \(p=0.0001\) \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Selected descriptive statistics of the reflectance value at a wavelength of 590–720 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** & & 0.3660 & 0.7624 & 0.9037 \\ \hline
**A\_20\_min** & 0.3660 & 0.2294 & 0.3061 \\ \hline
**A\_60\_min** & 0.7624 & 0.2294 & 0.8560 \\ \hline
**A\_120\_min** & 0.9037 & 0.3061 & 0.8560 \\ \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** & & 0.2176 & 0.6200 & 0.4576 \\ \hline
**B\_20\_min** & 0.2176 & 0.4576 & 0.0509 \\ \hline
**B\_60\_min** & 0.6200 & 0.4576 & 0.2176 \\ \hline
**B\_120\_min** & 0.4576 & 0.0509 & 0.2176 \\ \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** & & 0.4707 & 0.7179 & 0.7179 \\ \hline
**C\_20\_min** & 0.4707 & 0.2807 & 0.2807 \\ \hline
**C\_60\_min** & 0.7179 & 0.2807 & 1.0000 \\ \hline
**C\_120\_min** & 0.7179 & 0.2807 & 1.0000 \\ \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** & & 0.8542 & 0.9025 & 0.2016 \\ \hline
**D\_20\_min** & 0.8542 & 0.9512 & 0.1453 \\ \hline
**D\_60\_min** & 0.9025 & 0.9512 & 0.1625 \\ \hline
**D\_120\_min** & 0.2016 & 0.1453 & 0.1625 \\ \hline \hline \end{tabular}
\end{table}