PIGMENTS

Hamdallah Bearat's picture

Analyses minéralogiques sur les peintures altérées de la villa gallo-romaine de Vallon

Journal Title, Volume, Page: 
Revue d'Archéométrie 17, 65-74.
Year of Publication: 
1993
Authors: 
Béarat H
Current Affiliation: 
Department of Materials Science, Faculty of Engineering and Information Technology, An-Najah National University, Nablus. Palestine
Preferred Abstract (Original): 

The identified pigments in Vallon roman wall painting are : egyptian blue, calcite, goethite, haematite, green earth (céladonite or glauconite) and soot or charcoal. Owing to the fire, these paintings suffered considerable damages : cracking and weakening of the plaster and of the paints and change of some colours. We observe the transition from white to grey, from yellow to red ; from red to a more or less yellowish brown or to black ; from green to grey, to red or to brown and the disappereance of the black paint. After burial in a clayey and wet soil, these paints show different types of alteration : a calcareous patina and a lot of black spots associated with different colours. These spots were found to be iron and manganese oxides, probably produced by bacterial activity. A preliminary chemical test carried out on some treated paint fragments has shown the presence of some traces of the used chemical products.

Hamdallah Bearat's picture

Chemical and mineralogical analyses of Gallo-Roman wall painting from Dietikon, Switzerland

Journal Title, Volume, Page: 
Archaeometry Volume 38, Issue 1, pages 81–95, February 1996
Year of Publication: 
1996
Authors: 
Hamdallah A. Béarat
Institute of Mineralogy and Petrography, Fribourg University, Pérolles, CH-1700 Fribourg, Switzerland
Current Affiliation: 
Department of Materials Science, Faculty of Engineering and Information Technology, An-Najah National University, Nablus. Palestine
Preferred Abstract (Original): 
Around 90 samples of Roman wall painting dating from the first to the third century AD were analysed using different analytical techniques: X-ray diffraction, X-ray fluorescence, infrared spectrometry, scanning electron microscopy, energy dispersive spectrometry, optical microscopy and physico-chemical tests. The identified pigments are: ash, calcite, carbon black, celadonite, cinnabar, Egyptian Blue, glauconite, goethite, hematite and red lead. Pigment mixtures were used to get other colours such as brown, pink or purple. Three types of plaster were used: a first, and most dominant, with river sand, a second with crushed tile for damp places and a third, to which cinnabar was exclusively applied, was prepared with crushed calcite crystals.
Syndicate content