This study provides a new reason for the colour alteration of the first man-made pigments (Egypti... more This study provides a new reason for the colour alteration of the first man-made pigments (Egyptian blue, EB, "cuprorivaite" and Egyptian green, EG, "wollastonite"). The study focuses on the identification of the most efficient bacterial and fungal species that can grow upon copper-based pigment materials (Egyptian blue and Egyptian green); and their role in the discolouring phenomenon of these pigments. For this purpose, pigment materials from a limestone stela at the Egyptian Museum in Cairo (TR 4.1.21.1, SR 5/10603) were studied using light optical microscope (LOM), scanning electron microscopy-with energy dispersive spectroscopy (SEM-EDS), and x-ray fluorescence (XRF) to identify their composition. Pigment materials were also investigated biologically to determine the role played by microorganisms in their decay, and a spectrophotometer at 542 nm wavelength was used for detecting the chromatic alteration. The study proved that the black pigment is magnetite, ...
This study provides a new reason for the colour alteration of the first man-made pigments (Egypti... more This study provides a new reason for the colour alteration of the first man-made pigments (Egyptian blue, EB, "cuprorivaite" and Egyptian green, EG, "wollastonite"). The study focuses on the identification of the most efficient bacterial and fungal species that can grow upon copper-based pigment materials (Egyptian blue and Egyptian green); and their role in the discolouring phenomenon of these pigments. For this purpose, pigment materials from a limestone stela at the Egyptian Museum in Cairo (TR 4.1.21.1, SR 5/10603) were studied using light optical microscope (LOM), scanning electron microscopy-with energy dispersive spectroscopy (SEM-EDS), and x-ray fluorescence (XRF) to identify their composition. Pigment materials were also investigated biologically to determine the role played by microorganisms in their decay, and a spectrophotometer at 542 nm wavelength was used for detecting the chromatic alteration. The study proved that the black pigment is magnetite, ...
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Papers by Nora Saber