Investigating Nineteenth Century Gel Mediums: From Historical Recipes to Model Systems / Université Paris-Sorbonne (Paris) in Studies in conservation, Vol.68 N°3-4(2023; April-May) (2023-04-03)

Public ISBD [article]  inStudies in conservation > Vol.68 N°3-4(2023; April-May) (2023-04-03) . - Pages 357-364 Titre : Investigating Nineteenth Century Gel Mediums: From Historical Recipes to Model Systems Type de document : texte imprimé Auteurs : Université Paris-Sorbonne (Paris), Auteur Année de publication : 2023 Article en page(s) : Pages 357-364 Langues : Anglais (eng) Catégories : Colloïdes Fourier, Spectroscopie infrarouge à transformée de Gélification -- Teneur en plomb Liants -- 19e siècle -- Formules et recettes Peinture -- Matériaux -- 19e siècle -- Composition chimique Vernis Mots-clés : Megilp  Métal-résine  Gumtion Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : ABSTRACT Gelled mediums were widely used during the nineteenth century, added to paint on the palette to modify its rheological, optical, and drying properties. Many variations of gelled mediums exist in the literature, all with the common basis of mastic resin or varnish, drying oil, and a lead compound. With the aim of unveiling the chemistry of such systems, reconstructions were carried out not only following the historical recipes, but in addition, exploring variations and simplifications to get a better understanding of the key ingredients and interactions inducing gelation. Different parameters were tested to establish whether these have an impact on the gelation mechanisms, particularly the influence of the nature and proportions of the ingredients and the preparation process. These reconstructions and their FTIR characterisation reveal the formation of metal-resin soaps, but also underline the specific role of lead in the gelation. [article] Investigating Nineteenth Century Gel Mediums: From Historical Recipes to Model Systems [texte imprimé] / Université Paris-Sorbonne (Paris), Auteur . - 2023 . - Pages 357-364. Langues : Anglais (eng) in Studies in conservation > Vol.68 N°3-4(2023; April-May) (2023-04-03) . - Pages 357-364 Catégories : Colloïdes Fourier, Spectroscopie infrarouge à transformée de Gélification -- Teneur en plomb Liants -- 19e siècle -- Formules et recettes Peinture -- Matériaux -- 19e siècle -- Composition chimique Vernis Mots-clés : Megilp  Métal-résine  Gumtion Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : ABSTRACT Gelled mediums were widely used during the nineteenth century, added to paint on the palette to modify its rheological, optical, and drying properties. Many variations of gelled mediums exist in the literature, all with the common basis of mastic resin or varnish, drying oil, and a lead compound. With the aim of unveiling the chemistry of such systems, reconstructions were carried out not only following the historical recipes, but in addition, exploring variations and simplifications to get a better understanding of the key ingredients and interactions inducing gelation. Different parameters were tested to establish whether these have an impact on the gelation mechanisms, particularly the influence of the nature and proportions of the ingredients and the preparation process. These reconstructions and their FTIR characterisation reveal the formation of metal-resin soaps, but also underline the specific role of lead in the gelation.

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