{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,17]],"date-time":"2026-10-17T01:34:23Z","timestamp":1792200863167,"version":"4.4.0"},"reference-count":71,"publisher":"American Association for the Advancement of Science (AAAS)","issue":"47","content-domain":{"domain":["www.science.org"],"crossmark-restriction":true},"short-container-title":["Sci. Adv."],"published-print":{"date-parts":[[2025,11,21]]},"abstract":"<jats:p>\n                    Emerald green, a copper acetoarsenite pigment, enriched the 19th-century and 20th-century artists\u2019 palettes and caused darkening and fragilities in paintings. The accepted alteration mechanism involves the oxidation of triarsenite ions [(As\n                    <jats:sub>3<\/jats:sub>\n                    O\n                    <jats:sub>6<\/jats:sub>\n                    )\n                    <jats:sup>3\u2212<\/jats:sup>\n                    ] to arsenates (AsO\n                    <jats:sub>4<\/jats:sub>\n                    <jats:sup>3\u2212<\/jats:sup>\n                    ), although questions about the promoting factors and the origin of the oxidized arsenic remain unanswered. This study investigates the primary environmental parameters inducing alteration in the oil binder and elucidates the associated degradation pathways through a multiscale analytical approach, including noninvasive spectroscopic techniques and synchrotron radiation\u2013based x-ray methods. By combining results from a historical oil painting by James Ensor (1860 to 1949) and artificially aged paint mock-ups, we identified ultraviolet A\u2013visible light and humidity (relative humidity\u00a0\u2265\u00a095%) as key driving factors, inducing a dual degradation pathway: Light promotes surface-stratified arsenic oxidation (As\n                    <jats:sup>3+<\/jats:sup>\n                    \u00a0\u2192\u00a0As\n                    <jats:sup>5+<\/jats:sup>\n                    ) resulting in amorphous As\n                    <jats:sup>5+<\/jats:sup>\n                    -rich compounds, whereas a dark, high moisture environment favors arsenolite (As\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    ) crystallization. In addition, a noninvasive analytical strategy is proposed for monitoring the conservation state of emerald green paints in historical artworks.\n                  <\/jats:p>","DOI":"10.1126\/sciadv.ady1807","type":"journal-article","created":{"date-parts":[[2025,11,19]],"date-time":"2025-11-19T18:58:54Z","timestamp":1763578734000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":5,"title":["Discovering the dual degradation pathway of emerald green in oil paints: The effects of light and humidity"],"prefix":"10.1126","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-9661-7350","authenticated-orcid":true,"given":"Sara","family":"Carboni Marri","sequence":"first","affiliation":[{"name":"SMAArt Centre of Excellence and Department of Chemistry, Biology, and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy."},{"name":"CNR-SCITEC, Via Elce di Sotto 8, 06123 Perugia, Italy."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9489-7805","authenticated-orcid":true,"given":"Letizia","family":"Monico","sequence":"additional","affiliation":[{"name":"SMAArt Centre of Excellence and Department of Chemistry, Biology, and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy."},{"name":"CNR-SCITEC, Via Elce di Sotto 8, 06123 Perugia, Italy."},{"name":"AXIS Research Group, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1518-4784","authenticated-orcid":true,"given":"Francesca","family":"Rosi","sequence":"additional","affiliation":[{"name":"CNR-SCITEC, Via Elce di Sotto 8, 06123 Perugia, Italy."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6091-9922","authenticated-orcid":true,"given":"Costanza","family":"Miliani","sequence":"additional","affiliation":[{"name":"CNR-ISPC, Via Cardinale Guglielmo Sanfelice 8, 80134 Naples, Italy."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9666-2997","authenticated-orcid":true,"given":"Riccardo","family":"Vivani","sequence":"additional","affiliation":[{"name":"Department of Pharmaceutical Sciences, University of Perugia, Via del Liceo 1, 06123 Perugia, Italy."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6752-6408","authenticated-orcid":true,"given":"Koen","family":"Janssens","sequence":"additional","affiliation":[{"name":"AXIS Research Group, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium."},{"name":"ARCHES Research Group, University of Antwerp, Faculty of Design Sciences, Mutsaardstraat 31, 2000 Antwerp, Belgium."},{"name":"Rijksmuseum, Conservation &amp; 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