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Università degli Studi di Ferrara (2012)

Technological study of the seventeenth century haft rang tiles in Iran with a comparative view to the cuerda seca tiles in Spain

HOLAKOOEI, Parviz

Titre : Technological study of the seventeenth century haft rang tiles in Iran with a comparative view to the cuerda seca tiles in Spain

Auteur : HOLAKOOEI, Parviz

Université de soutenance : Università degli Studi di Ferrara.

Grade : DOTTORATO DI RICERCA IN ‘SCIENZE e TECNOLOGIE per l’ARCHEOLOGIA e i BENI CULTURALI’ 2012

Résumé partiel
This thesis provides firsthand information about the seventeenth century haft rang tiles in Iran using various analytical approaches, including optical microscopy, wavelength dispersive x-ray fluorescence (WDXRF), x-ray diffraction (XRD), densitometry, ultraviolet visible spectroscopy (UV-Vis spectroscopy), micro-Raman spectroscopy, and energy dispersive x-ray spectroscopy (EDS). Here, optical microscopy was mainly used to have a general idea about the stratigraphy and various layers of the haft rang tiles. WDXRF was however used to respond to the question of the provenance of the tiles as this subject has always been of interest to frame the archaeological context of haft rang tiles. Another issue emphasised in this thesis is the thermal history of the tiles, which was studied by XRD and measuring the density of the bodies’ tiles. This subject was particularly was interesting for me to delve into because multi layer structure of haft rang tiles makes the study of thermal behaviour of the bodies much complicated. On the other hand, the study of the coloured glazes was firstly achieved by UV-Vis spectroscopy, where the possible colourants and network modifiers of the glazes were studied. MicroRaman spectroscopy, however, presented very notable results about the opacifiers and un-dissolved particles suspended in the glazes’ matrixes. EDS microanalyses were nonetheless carried out to have a general idea about the chemical composition of the glazes and their fluxes, opacifiers, and network formers. Another subject on which this thesis shed light is the attribution of haft rang technique to the Spanish technique of cuerda seca. In the discussion and final chapters of the thesis, an attempt is made to put together the technological features of these two techniques. What can be at least understood on the evidences exist about these two techniques is that there is no technological reason by which haft rang technique can be attributed to cuerda seca. The use of black line for separating coloured glazes in Iran, as showed in this thesis, has a history much longer the history of cuerda seca. Hence, I have finally suggested that cuerda seca is an inappropriate term to cover the seventeenth century Persian polychrome tiles. The term ‘haft rang,’ which is used for nominating the antecedents of the seventeenth century polychrome tiles, is preferred in this thesis as this term is also widely used in today’s Iran to address this type of polychrome tiles.

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