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\bibitem{Pastorelli_etal2024} {\textquotedblleft}\textit{Darkening of lead white in old master drawings and historic prints : a multi-analytical investigation}{\textquotedblright}. Pastorelli G, Miranda ASO, Avranovich Clerici E, d{\textquoteright}Imporzano P, Hansen BV, Janssens K, Davies GR, Borring N, Microchemical journal \textbf{199}, 109912 (2024).   http://doi.org/10.1016/J.MICROC.2024.109912

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