Non-invasive evidence of mercury soaps in painted miniatures on ivory Silvia Garrappa, Petr Bezdička, Silvie Švarcová, Janka Hradilová, Michal Pech and David Hradil Eur. Phys. J. Plus, 138 3 (2023) 219 Published online: 08 March 2023 DOI: 10.1140/epjp/s13360-023-03847-z