Mendeley  

Zotero  

Bahadori R. Identification of Copper-Arsenic Green Pigments in Some Paintings and Manuscript Decorations of the Qajar Period. KCR 2017; 1 (3) :1-12
URL: http://journal.richt.ir/kcr/article-1-35-en.html

 Synthetic green copper-arsenic pigments include two pigments: shale green (CuHAsO3) and emerald green (3Cu(AsO2)2.Cu(CH3CO)2)
,which were common in Europe in the 18th and 19th centuries. During the Qajar period, these two pigments were introduced to Iran due to trade with the West, and due to their cheapness and transparency, they quickly replaced other green pigments such as verdigris and malachite. The purpose of this study is to investigate the presence of these pigments in Qajar period paintings and to choose the best method to identify these two pigments. For this purpose, green was sampled from a painting on glass, a painting on wood, a mural, and a manuscript, all of which belonged to the Qajar period. To identify the pigments, instrumental methods such as Fourier transform infrared spectroscopy (FTIR) equipped with an ATR reflection cell, X-ray diffractometry (XRD) and scanning electron microscopy equipped with an X-ray dispersive X-ray (SEM/EDX) were used . The results proved the presence of emerald green in the painting behind the glass of the Rashvand Khaneh in Qazvin, the wall painting of the Karimkhani Citadel in Shiraz and the decorations used in a Quranic manuscript and Shaileh green in the painting on the wood of the Saqanfar in Babylon. The results also showed that the best and fastest method for analyzing these two compounds is FTIR, which can identify these two pigments with a minimum sample and distinguish them from each other due to their structural differences.