Artificial Ageing Study and Evaluation of Methods for Oil Removal on Decorative Plaster in Artistic Hispano-Muslim Artworks

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Argitaratua izan da:Applied Sciences vol. 15, no. 12 (2025), p. 6730
Egile nagusia: Vivar-García, Eva
Beste egile batzuk: García-Bueno, Ana, Germinario, Silvia, Potenza Marianna, Bergamonti Laura, Graiff Claudia, Casoli Antonella
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MDPI AG
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100 1 |a Vivar-García, Eva  |u Department of Painting, University of Granada, Avenida de Andalucía 27, 18014 Granada, Spain; anagar@ugr.es 
245 1 |a Artificial Ageing Study and Evaluation of Methods for Oil Removal on Decorative Plaster in Artistic Hispano-Muslim Artworks 
260 |b MDPI AG  |c 2025 
513 |a Journal Article 
520 3 |a This study investigates Hispano-Muslim plasterworks, exemplified by the Cuarto Real de Santo Domingo, the Madraza, and the Alhambra in Granada, focusing on cleaning methods to remove oil-based repaintings without damaging the original polychromies. To this end, samples replicating traditional materials (gypsum coating, pigments, and binders) and techniques (tempera painting) were prepared and subjected to an artificial ageing protocol (AAP). Subsequently, cleaning tests aimed at removing the oil repaintings were performed to recover the original polychromies. Analytical techniques, including Fourier Transform Infrared Spectroscopy (FTIR), Gas Chromatography–Mass Spectrometry (GC–MS), and colorimetry, were employed to evaluate ageing effects and cleaning efficacy. Results revealed significant chromatic alterations in vermilion and azurite bound with animal glue, while ochre remained comparatively stable. Chemical analyses indicated marked binder deterioration, including protein denaturation in animal glue and oxidation/polymerization in linseed oil. Cleaning tests demonstrated that both a heptane–acetone gel and a novel polyamidoamine–glycine (PAAGLY) treatment effectively removed oil-based repaintings while preserving the original layers. These findings highlight the critical role of pigment–binder interactions in conservation strategies and advocate for selective, minimally invasive restoration methods. 
653 |a Plaster 
653 |a Hydrocarbons 
653 |a 19th century 
653 |a Muslims 
653 |a Cellulose 
653 |a Solvents 
653 |a Chromatography 
700 1 |a García-Bueno, Ana  |u Department of Painting, University of Granada, Avenida de Andalucía 27, 18014 Granada, Spain; anagar@ugr.es 
700 1 |a Germinario, Silvia  |u Department Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy; silvia.germinario@unipr.it (S.G.); marianna.potenza@unipr.it (M.P.); laura.bergamonti@unipr.it (L.B.); claudia.graiff@unipr.it (C.G.); antonella.casoli@unipr.it (A.C.) 
700 1 |a Potenza Marianna  |u Department Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy; silvia.germinario@unipr.it (S.G.); marianna.potenza@unipr.it (M.P.); laura.bergamonti@unipr.it (L.B.); claudia.graiff@unipr.it (C.G.); antonella.casoli@unipr.it (A.C.) 
700 1 |a Bergamonti Laura  |u Department Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy; silvia.germinario@unipr.it (S.G.); marianna.potenza@unipr.it (M.P.); laura.bergamonti@unipr.it (L.B.); claudia.graiff@unipr.it (C.G.); antonella.casoli@unipr.it (A.C.) 
700 1 |a Graiff Claudia  |u Department Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy; silvia.germinario@unipr.it (S.G.); marianna.potenza@unipr.it (M.P.); laura.bergamonti@unipr.it (L.B.); claudia.graiff@unipr.it (C.G.); antonella.casoli@unipr.it (A.C.) 
700 1 |a Casoli Antonella  |u Department Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy; silvia.germinario@unipr.it (S.G.); marianna.potenza@unipr.it (M.P.); laura.bergamonti@unipr.it (L.B.); claudia.graiff@unipr.it (C.G.); antonella.casoli@unipr.it (A.C.) 
773 0 |t Applied Sciences  |g vol. 15, no. 12 (2025), p. 6730 
786 0 |d ProQuest  |t Publicly Available Content Database 
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