This project, to be realized by an intrinsically interdisciplinary group composed by scientists, historians and conservators, is devoted to the chemical and micro-structural analysis of paint layers and decorated glass and glaze. The object is the determination of the specific techniques used in their production, as well as, the transformations suffered. Considering that those decorative layers have mainly an aesthetic object, we will emphasise in the determination of the optical properties (colour, shine, transparency, opacity). Both the paint layers and the glass and glaze decorations share a same analytical problematic: they are formed by a succession of micrometric layers of heterogeneous composition, to original components other resulting from aging and alteration are added. For this reason, a set of complementary high sensible non-destructive micro-analytical techniques are necessary for their study. The actual aspect of those layers results from the procedure followed and the materials used in their production (technology), modified by the transformations of the materials due to their intrinsic reactivity (aging), as well as, interaction with the environment (weathering). The methodology followed in this study consists: firstly, an historical and archaeological, documentary study of the material and production processes and techniques; secondly, selection, preparation and analyses of the materials; thirdly, determination and modelling of the optical properties, as well as, of the transformations suffered by the materials; and, finally, the identification of the pathologies and the establishment of restoration and conservation protocols. The study will produce information relevant to the Historical perspective (materials and techniques used in different times and geographical areas), to the Museum conception (determination of the original appearance and the methods of production), as well as, to conservation issues. The specific topics of study proposed here are, in the field of painting materials, the identification, stability and reactivity of the organic coatings applied to protect the paint layers over wood background, as well as, varnishes applied over gold and silver foils and the boles over which the metal foils are fixed in Baroque art works. In the field of decorated glazed ceramics the project is devoted to the introduction of decorated tin glazes in Islamic times in the west Mediterranean and Al-Andalus; as well as, the evolution of the pigments in the Manises workshops (1300-1900). Finally, concerning decorated glass, smalts, grisailles and yellow stains will be studied in 19th century pre-modernists and modernists stain glasses with special emphasis in the identification of the materials used and its relation with the conservation state of the art works. The decorations of this period are showing a remarkable deterioration and their stability and conservation has devoted some debate in Europe. The study is performed in collaboration with an enterprise devoted to the restoration of stain glass, J.M.Bonet, with the object to understand the mechanisms responsible for the degradation and to establish a protocol for their stabilisation and a deontology of restoration.
Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016
Programa Estatal de I+D+i Orientada a los Retos de la Sociedad
Retos de Investigación: Proyectos de I+D+i
Gobierno De España. Ministerio De Economía Y Competitividad, Mineco
Tite, M.; Watson, O.; Pradell, T.; Matin, M.; Molina, G.; Domoney, K.; Bouquillon, A. Journal of archaeological science Vol. 57, p. 80-91 DOI: 10.1016/j.jas.2015.02.005 Date of publication: 2015-05-01 Journal article