Darkening of lead- and iron-based pigments on late Gothic Italian wall paintings: Energy dispersive X-ray fluorescence, μ-Raman, and powder X-ray diffraction analyses for diagnosis: Presence of β-PbO2 (plattnerite) and α-PbO2 (scrutinyite)

1. Costantini, I.
2. Lottici, P.P.
3. Bersani, D.
4. Pontiroli, D.
5. Casoli, A.
6. Castro, K.
7. Madariaga, J.M.