The contribution of diffuse reflectance spectroscopy to the knowledge of prehistoric red colouring matter
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26 novembre 2020
- handle: 10670/1.3fxu12
- hal: hal-03099173
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info:eu-repo/grantAgreement//654208/EU/EUROPLANET 2020 Research Infrastructure/EPN2020-RI
info:eu-repo/semantics/OpenAccess
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Prehistoric antiquities Prehistory Prehistoric archaeology Spectrochemistry Analysis, Spectrum Spectroscopy Spectra Spectrochemical analysis Coefficient of reflection Total reflectance, Radiant Radiant total reflectance Reflectivity (Optics) Reflection coefficient Reflection factor Powder Early man Prehistoric human beings Cavemen (Prehistoric peoples) Prehistoric humans Man, Prehistoric Prehistory Prehistoric archaeologyCiter ce document
Emilie Chalmin et al., « The contribution of diffuse reflectance spectroscopy to the knowledge of prehistoric red colouring matter », HAL-SHS : archéologie, ID : 10670/1.3fxu12
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Understanding archaeological colouring matter commonly found at prehistoric sites is not always easy, because powdering, mixing and weathering blur the characteristics of its provenance. However, studying colouring and coloured artefacts enables the questioning of the processing techniques used to exploit them. Various studies are interested in recognizing these red colouring matter through their mineralogy, chemistry and petrography. Here, we seek to understand to what extent it is possible to isolate a spectral fingerprint of a ferruginous raw materials by radiospectrometry whatever their physical state (cohesive rock, powder, applied mixture on limestone). By using two spectro-gonio radiometers, we characterized the visible and near-infrared reflectance spectra of six geological references, selected for their singular mineralogical and chemical compositions as well as their hues. We identified single spectral signature for each reference. Furthermore, these signatures can be identified even in powders and mixtures due to mineral phase associations.