## 4 Final Discussion and Conclusions
Furthermore, they will also be able to provide useful indications for ongoing research in other application fields where this material is used, such as in sensor technology and construction. The following supporting information can be downloaded at [[https://www.mdpi.com/article/10.3390/app15094630/s1](https://www.mdpi.com/article/10.3390/app15094630/s1)]([https://www.mdpi.com/article/10.3390/app15094630/s1](https://www.mdpi.com/article/10.3390/app15094630/s1)), Table S1: IR and Raman band assignment of manganese violet pigment; Table S2: IR band assignment of Oil_V and Oil_V_COMM samples before accelerating aging; Table S3: Pyrolysis fragments of unaged Oil_V and Oil_V_COMM samples detected by THM-Py-GC/MS analysis listed and described according to their retention time (RT, min), their compound name, and their mass to charge ratio (\(m/z\)) with the respective base peak not written in brackets. ME=methyl mester; Table S4: IR band assignment of Alk_V sample before accelerating aging; Table S5: Pyrolysis fragments of unaged Alk_V sample detected by THM-Py-GC/MS analysis listed and described according to their retention time (RT, min), their compound name, and their mass to charge ratio (\(m/z\)) with the respective base peak not written in brackets. ME=methyl ester; Table S6: IR band assignment of Acr_V sample before accelerating aging; Table S7: Pyrolysis fragments of unaged Acr_V sample detected by Py-GC/MS analysis listed and described according to their retention time (RT, min), their compound name, and their mass to charge ratio (\(m/z\)) with the respective base peak not written in brackets. ME=methyl ester; Table S8: IR band assignment of Sty_V sample before accelerating aging; Table S9: Pyrolysis fragments of unaged Sty_V sample detected by Py-GC/MS analysis listed and described according to their retention time (RT, min), their compound name, and their mass to charge ratio (\(m/z\)) with the respective base peak written not in brackets; Table S10: Photos of paint samples taken at different times: before the aging, immediately after aging, 3, 6, 10, 20 and 45 days after the end of accelerated aging; Table S11: Microscopic images (\(100\times\), \(200\times\), \(300\times\), \(500\times\)) of paint samples taken at different times: immediately after aging, 10 and 45 days after the end of accelerated aging; Table S12: Integrated area values of samples analysed; Table S13: Normalized % in weight of the most abundant compounds of Acr_V sample detected; Table S14: Normalized % in weight of the most abundant compounds of Sty_V sample detected; Figure S1: IR spectrum of Oil_V (blue) and Oil_V_COMM (red) samples acquired before accelerating aging; Figure S2: Raman spectra of Oil_V (blue) and Oil_V_COMM (red) samples acquired before accelerating aging and obtained with a 785 nm laser. Only peaks related to the organic fraction are signed; Figure S3: IR spectrum of Alk_V sample acquired before accelerating aging; Figure S4: Total ion current (TIC) program obtained from Alk_V sample before accelerated aging; Figure S5: IR spectrum of Acr_V sample acquired before accelerating aging; Figure S6: Total ion current (TIC) pyrogram obtained from Acr_V sample before accelerated aging; Figure S7: IR spectrum of Sty_V sample acquired before accelerating aging; Figure S8: Total ion current (TIC) pyrogram obtained from Sty_V sample before accelerated aging; Figure S9: EDX spectra obtained on the crystals formed after accelerated aging. (A) CRY_1 spectrum (B) CRY_2 spectrum (C) CRY_3 spectrum; Figure S10: \(\mu\)-Raman spectra acquired on the paint samples after the accelerated aging and obtained with a 785 nm laser. (a) Oil_V, (b) Sty_V; Figure S11: XRPD pattern of the surface crystals along with the (NH4)2(HS04)(H2 PO4) reference (ICSD#100795); Figure S12: Kubelka-Munk functions of the PV16 pigment (a) and the Sty_V sample (b) after accelerated aging.