Absorption spectra obtained for the mammoth tusk in non-polarized radiation: 1-(Kramers-Kronig method). 2-technology KBr.

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... generalizing the results of application of the IR reflection spectroscopy method to the investigation of mineralization process of mammoth tusks, we should note that the optical model of a porous surface that was proposed in the first part of this work forms guidelines for correct mathematical processing of spectra, which makes it possible to extract reliable data on frequencies in the vibrational spectrum of the object. Figure 2 shows a comparison of the normalized absorption spectra for a fragment of a mammoth's tusk, obtained by the traditional KBr(powder) method and specular reflection without disturbing the surface (method Kramers-Kronig). Useful information can be obtained from the analysis of the spectra of oriented tusk fragments in polarized radiation (Figure 3). ...