Color Under Siege: Material Analysis and Housing of Late Nineteenth-Century Posters from the Siege and Commune of Paris / Jess Ortegon in Studies in conservation, Vol.70 N°7-8(2025; October-November) (2025-10-01)  

Public ISBD [article]  inStudies in conservation > Vol.70 N°7-8(2025; October-November) (2025-10-01) . - P. 620-630 Titre : Color Under Siege: Material Analysis and Housing of Late Nineteenth-Century Posters from the Siege and Commune of Paris Type de document : texte imprimé Auteurs : Jess Ortegon (19..-....), Auteur Année de publication : 2025 Article en page(s) : P. 620-630 Langues : Anglais (eng) Catégories : Affiches politiques -- France -- 19e siècle -- Conservation et restauration Métaux lourds -- Toxicologie Microscopie Microscopie de polarisation Paris (France) -- 1871 (Commune) -- Affiches -- Conservation et restauration Pigments -- Toxicologie Spectroscopie de fluorescence Spectroscopie Raman Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : The Charles Deering McCormick Library of Special Collections at Northwestern University Libraries holds a significant collection of original materials on the Siege and Commune of Paris (ca. 1870-1871) including over 1,000 printed posters. 262 of these posters were printed on colored papers, which present unique material challenges for their preservation. By the 1860s, synthetic dyes and pigments nearly replaced natural colorants historically used in paper production as they were thought to be vastly superior in vibrancy and ease of use. Some synthetic pigments used in the late nineteenth century contain heavy metals such as lead, chromium, and mercury, adding health and safety concerns to treatment and housing considerations. Twenty-eight colored posters from the collection were examined using optical microscopy and X-ray fluorescence spectroscopy (XRF) to investigate their elemental profiles, while five of the 28 posters underwent further examination using polarized light microscopy (PLM) and Raman spectroscopy to identify suspected heavy metal pigments. XRF confirmed the elemental presence of lead and chromium in orange, yellow, green, and peach posters, and Raman analysis identified the pigment chrome yellow in the yellow and green posters. The results obtained were used to inform treatment and housing protocols alongside established institutional guidelines to reduce health and safety risks and address physical condition issues. En ligne : https://www.tandfonline.com/doi/full/10.1080/00393630.2025.2460409#abstract [article] Color Under Siege: Material Analysis and Housing of Late Nineteenth-Century Posters from the Siege and Commune of Paris [texte imprimé] / Jess Ortegon (19..-....), Auteur . - 2025 . - P. 620-630. Langues : Anglais (eng) in Studies in conservation > Vol.70 N°7-8(2025; October-November) (2025-10-01) . - P. 620-630 Catégories : Affiches politiques -- France -- 19e siècle -- Conservation et restauration Métaux lourds -- Toxicologie Microscopie Microscopie de polarisation Paris (France) -- 1871 (Commune) -- Affiches -- Conservation et restauration Pigments -- Toxicologie Spectroscopie de fluorescence Spectroscopie Raman Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : The Charles Deering McCormick Library of Special Collections at Northwestern University Libraries holds a significant collection of original materials on the Siege and Commune of Paris (ca. 1870-1871) including over 1,000 printed posters. 262 of these posters were printed on colored papers, which present unique material challenges for their preservation. By the 1860s, synthetic dyes and pigments nearly replaced natural colorants historically used in paper production as they were thought to be vastly superior in vibrancy and ease of use. Some synthetic pigments used in the late nineteenth century contain heavy metals such as lead, chromium, and mercury, adding health and safety concerns to treatment and housing considerations. Twenty-eight colored posters from the collection were examined using optical microscopy and X-ray fluorescence spectroscopy (XRF) to investigate their elemental profiles, while five of the 28 posters underwent further examination using polarized light microscopy (PLM) and Raman spectroscopy to identify suspected heavy metal pigments. XRF confirmed the elemental presence of lead and chromium in orange, yellow, green, and peach posters, and Raman analysis identified the pigment chrome yellow in the yellow and green posters. The results obtained were used to inform treatment and housing protocols alongside established institutional guidelines to reduce health and safety risks and address physical condition issues. En ligne : https://www.tandfonline.com/doi/full/10.1080/00393630.2025.2460409#abstract

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