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Hamzavi Y. (2026). Characterization and Identification of Colorants in the Paint Layers of the Architectural Ornaments of the Masoudi House, Tuyserkan, Hamadan. JRA. 12(1), : 6 doi:10.66224/jra.2026.12.106
URL: http://jra-tabriziau.ir/article-1-515-en.html

This study investigates the structure and composition of paint layers applied to the architectural ornaments of the Shahneshin room of the Masoudi House in Tuyserkan, a valuable Qajar-period building. Given the diversity of motifs and colors in the mural paintings and gypsum-based and the lack of technical and materials-based studies, this research aimed to identify the colorants and examine the structural characteristics of the paint layers. Accordingly, twelve paint samples representing light green, yellow ochre, red, blue, light gray-green, orange, and brown hues were examined using digital microscopy and scanning electron microscopy coupled with point energy-dispersive X-ray spectroscopy (SEM–EDS). The results showed that the painting systems of the mural paintings and gypsum-based ornaments were based on a diverse range of mineral pigments and multi-component mixtures. The analytical evidence is consistent with the presence of iron-, copper-, lead-, chromium-, cobalt-, and arsenic-based pigments, as well as ultramarine. In several samples, the combination of two or more pigments and the simultaneous use of lightener or filler materials played an im-portant role in producing the final hues. Furthermore, analysis of the metallic layer showed that it was predominantly composed of copper and zinc and consistent with a copper–zinc alloy (brass); minor amounts of gold, lead, and tin were also detected. Overall, the findings reveal the diversity of materials and painting technologies employed at the Masoudi House and provide valuable data for a better understanding of deterioration mecha-nisms and selecting compatible materials and methods for the conservation and restoration of this historic building.