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After a few years, some spots and stains have appeared on the greenish areas of the panels. The common factor is that the panels were produced using the same green enamel. The present work reports on the studies of the observed alterations in green enamels to propose possible degradation mechanisms. These studies are based on using different analytical techniques such as optical microscopy, scanning electron microscopy energy dispersive X\u2010ray spectroscopy, inductively coupled plasma mass spectrometry, laser\u2010induced breakdown spectroscopy, X\u2010ray diffraction, <jats:italic>\u00b5<\/jats:italic>\u2010Raman spectroscopy, profilometry, X\u2010ray photoelectron spectroscopy, and UV\u2013vis spectroscopy. The characterization of the fragments from the original panels showed that a brown layer of dark lead compounds was formed on the green enamel. The alteration occurred in a 3\u2010step alteration mechanism divided into Pb<jats:sup>2+<\/jats:sup> lixiviation from the enamel, formation of hydrocerussite (2PbCO<jats:sub>3<\/jats:sub>\u00b7Pb(OH)<jats:sub>2<\/jats:sub>), and transformation into scrutinyite (<jats:italic>\u03b1<\/jats:italic>\u2010PbO<jats:sub>2<\/jats:sub>) and plattnerite (<jats:italic>\u03b2<\/jats:italic>\u2010PbO<jats:sub>2<\/jats:sub>).<\/jats:p>","DOI":"10.1002\/cplu.202500205","type":"journal-article","created":{"date-parts":[[2025,7,3]],"date-time":"2025-07-03T15:04:18Z","timestamp":1751555058000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["From Green to Brown: Characterization of the Fast Alteration of Modern Greenish Enamels in Glass Windows"],"prefix":"10.1002","volume":"90","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3762-8788","authenticated-orcid":false,"given":"Teresa","family":"Palomar","sequence":"first","affiliation":[{"name":"Instituto de Cer\u00e1mica y Vidrio (ICV) CSIC  c\/Kelsen 5. Campus de Cantoblanco 28049 Madrid Spain"},{"name":"Unidade de Investiga\u00e7\u00e3o VICARTE\u2014Vidro e Cer\u00e2mica para as Artes NOVA School of Science and Technology Universidade Nova de Lisboa  Hangar III\u2014Campus da Caparica 2829\u2013516 Caparica Portugal"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2633-2989","authenticated-orcid":false,"given":"David G.","family":"Calatayud","sequence":"additional","affiliation":[{"name":"Instituto de Cer\u00e1mica y Vidrio (ICV) CSIC  c\/Kelsen 5. 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