عنوان مقاله [English]
Purpose: To explore the technique used in a large (140*50 cm) paper photograph of Ahmad Shah Qajar. This is the first time that the technique of large format photograph of the Qajar era has been studied using device analysis.
Method/Research Design: Mixed methodology is used, including laboratory methods like X-Ray Fluorescence (XRF), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope (SEM), wet chemistry and microscopic examination.
Findings: The technique used in the photograph is Collodion. According to the electron microscope and the presence of thin layer of barium sulfate under the emulsion, the photo is a kind of opaque Collodion with gold spectroscopy. Results from X-Ray Fluorescence (XRF) show that white lead is used in retouching the hat and pencil in improving the quality of the face, hat and collar of the king's clothes.