Surface-enhanced Raman spectroscopy for madder lake detection in painting layers S. Innocenti, M. Ricci, D. Quintero Balbas, R. Fontana, J. Striova and M. Becucci Eur. Phys. J. Plus, 138 5 (2023) 381 Published online: 04 May 2023 DOI: 10.1140/epjp/s13360-023-03964-9