Mortars, pigments and binding media of wall paintings in the ‘Carrera del Darro’ in Granada, Spain
2000; Elsevier BV; Volume: 1; Issue: 1 Linguagem: Inglês
10.1016/s1296-2074(99)00117-x
ISSN1778-3674
AutoresEloísa Manzano, Ana García Bueno, Antonio González‐Casado, Monsalud del Olmo‐Iruela,
Tópico(s)Conservation Techniques and Studies
ResumoThe Carrera del Darro is a street within the city of Granada, Spain, which is emblematic owing to the architectural value of its buildings, to its significance for the urban structure of the city and to the implications it has for the surroundings of the Alhambra. Our study concerns the chemical analysis of the mural paintings on four façades, corresponding to numbers 23, 25, 27 and 29 of the Carrera del Darro. From the analysis of the mortar, it may be concluded that the composition is very similar, though not identical, in the four paintings studied: a limestone mortar. Ochre, white, black and red were used for the decoration of the four façades; green pigment was also observed in the second decoration of no. 29. The results of the morphological examination and EDX microanalysis of the paint samples are shown. By means of the thermogravimetric analysis we established the existence of an organically derived compound. After the existence of an oleaginous binder had been discounted by gas chromatography/mass spectrometry (GC/MS) analysis, we continued with the extraction and determination of proteins by spectrophotometry analysis, detecting low levels of proteins in the paint on the four façades analysed. The study was completed by evaluating the influence on the deterioration of the paintings by the possible surface presence of salts (such as nitrates or chlorides) and organic compounds.
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