Colour assays: An inside look into Alentejo traditional limewash paintings and coloured lime mortars |
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| Authors: | Milene Gil Jose Aguiar Ana Seruya Rosário Veiga Luisa Carvalho Helena Vargas Jose Mirão Antonio Candeias |
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| Affiliation: | 1. Conservation Restoration Department, Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, 2829‐516 Caparica, Portugal;2. Atomic Physics Centre, Universidade de Lisboa, Avenida Prof. Gama Pinto2, 1649‐003 Lisboa, Portugal;3. Faculty of Architecture, Universidade Técnica de Lisboa, Rua Sá Nogueira, Pólo Universitário Alto da Ajuda, 1349‐055 Lisboa, Portugal;4. Buildings Department, Laboratório Nacional de Engenharia Civil, Avenida do Brasil 101‐1700‐066 Lisboa, Portugal;5. Lab of Materials Studies, Instituto dos Museus e da Conserva??o, Palácio Nacional da Ajuda Ala Sul, 4a Andar, 1349‐021 Lisboa, Portugal;6. Geosciences Department and évora Geophysics Center, Universidade de évora, Rua Rom?o Ramalho, 7000‐671 évora, Portugal;7. Chemistry Department and évora Chemistry Center, Universidade de évora, Rua Rom?o Ramalho, 7000‐671 évora, Portugal |
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| Abstract: | A series of colour assays were conducted taking into account old bibliographic recommendations and oral testimony regarding traditional lime painting technology from the Alentejo (South Portugal) region. The main objectives were: (a) the colorimetric analysis of paintings made with different limewash preparation methods; (b) the comparison between natural processed red and yellows ochre pigments (“home made” and from industrial origin) and synthetic iron oxides in different concentrations and lime proportions; (c) the evaluation of the colorimetric CIELAB coordinates during the lime carbonation process in coloured mortars and limewashes. The results shows that the evolution of L*, a*, and b* during the carbonation process is independent of pigment concentration and paint thickness but dependent of pigment composition and finishing technique (lime painting or coloured mortar). They also emphasize the importance of surface appearance attributes and its influence on the colorimetric parameters. © 2010 Wiley Periodicals, Inc. Col Res Appl, 36, 61–71, 2011 |
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| Keywords: | colorimetry limewash pigments architectural conservation |
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