The preliminary information on the properties and distribution of coloring materials present on the mummy bandages collected through the MSI techniques is confirmed and amplified in order to overcome the limits of the method and the challenges created by the nature of the wrappings. Fibre optic reflectance spectroscopy (FORS) is a non-invasive technique which shows the reflectance, absorbance or transmittance features of materials in a spectral profile, covering the ultraviolet (UV), visible (Vis), near (NIR) and shortwave infrared (SWIR) part of the electromagnetic spectrum.
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Fibre optic reflectance spectra are acquired through Ocean Optics USB2000+ Spectrometer responds in the range 400–800 nm. After the selection of the measurement points, guided by the results previously obtained by the MSI techniques, a broad-band light source (probe) is positioned on the area of interest.
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The spectral profile produced shows the behavior of a material to light which is reliant on its chemical composition. Consequently, this technique often provides conclusive information on the nature of coloring matters. |