Identifying the Blue Pigments Used in Painted Architectural Decorations of Ilkhanid Buildings (1251–1335 AD) in Yazd, Central Iran
Issue: Vol 4 No. 1 (2017)
Journal: Journal of Islamic Archaeology
This paper reports the identification of the blue pigments used in the painted stucco decoration in three Ilkhanid (1251–1335 AD) (650–736 AH) buildings in Yazd: the Madrasah of Sayed Shams-al-Dīn, the Madrasah of Sayed Kamāl-al-Dīn, and the Madrasah of Sayed Rukn-al-Dīn. The significance of these buildings lies in the fact that these are the latest extant buildings of the period in the city with such extensive painted wall stucco. For the purpose of this study, six samples were tested in total, two from each building. Four types of laboratory instrumental analysis were conducted in this study: Fourier transform infrared spectroscopy (FTIR), polarizing microscopy (PLM), X-ray fluorescence (XRF) and X-ray diffraction (XRD). Copper was found by XRF, carbonated combinations were identified as a result of FTIR analysis, blue-turquoise crystals were seen under the polarizing microscope, and an azurite phase was identified by XRD analysis. These results indicate that azurite, a blue-colored copper carbonate, has been used as a blue pigment in three Ilkhanid monuments, the madrasas of Sayed Shams-al-Dīn, Sayed Kamāl-al-Dīn, and Sayed Rukn-al-Dīn, in Yazd, Iran.
Author: Adele Mohtasham, Kouros Samanian
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