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Resumen:
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The 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 fac�ades,
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 fac�ades; 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 fac�ades 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. |
