Analytical investigations carried out by different methods (colorimetry, plasma emission spectroscopy, X-Ray Fluorescence [XRF], chromatography and electrum spray), started during archaeological excavations in 2004-2008. Samples of residues of different colours were taken inside different types of pottery; moreover samples of sediments were recovered from inside the holes of loom weights; analyses showed that dyes were obtained from officinal plants and molluscs of the Mediterranean area. The dyes are Purple of Tyre, Blue Indigo and Yellow Rutina, that were mixed to obtain a wide range of secondary colours. The specimens under study have been defined chromatically, under transmitted light, using the new Munsell system (Macheth Division, 1999). For every specimen, we report tonal values, chromatic values, and RGB coordinates. For the analyses of non self-luminous colored surfaces, we referred to the CEILAB gamma and standard. This standard contains two pieces of information, one regarding luminance, represented by the Y component, and the other regarding chromaticity, defined as the direction of the tristimulus vector. Iron and copper minerals taken from SU G7L5 and alums of AL, Fe and Cr, were used as color fixing solutions (stains). These attestations, deriving from dated of archaeological levels with the method of the C14 to the 2000-1950 B.C., place various questions of chronological review regarding the origin and spread of these substances and to the relative technological procedures for the manufacture of the colorimetric matrices of base, as till now ancient find. they attested the presence of natural substances dye not before the 1200 B.C..
The ancient colour of Pyrgos - Mavrorachi, Cyprus
Lentini Alessandro
2010
Abstract
Analytical investigations carried out by different methods (colorimetry, plasma emission spectroscopy, X-Ray Fluorescence [XRF], chromatography and electrum spray), started during archaeological excavations in 2004-2008. Samples of residues of different colours were taken inside different types of pottery; moreover samples of sediments were recovered from inside the holes of loom weights; analyses showed that dyes were obtained from officinal plants and molluscs of the Mediterranean area. The dyes are Purple of Tyre, Blue Indigo and Yellow Rutina, that were mixed to obtain a wide range of secondary colours. The specimens under study have been defined chromatically, under transmitted light, using the new Munsell system (Macheth Division, 1999). For every specimen, we report tonal values, chromatic values, and RGB coordinates. For the analyses of non self-luminous colored surfaces, we referred to the CEILAB gamma and standard. This standard contains two pieces of information, one regarding luminance, represented by the Y component, and the other regarding chromaticity, defined as the direction of the tristimulus vector. Iron and copper minerals taken from SU G7L5 and alums of AL, Fe and Cr, were used as color fixing solutions (stains). These attestations, deriving from dated of archaeological levels with the method of the C14 to the 2000-1950 B.C., place various questions of chronological review regarding the origin and spread of these substances and to the relative technological procedures for the manufacture of the colorimetric matrices of base, as till now ancient find. they attested the presence of natural substances dye not before the 1200 B.C..I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
