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Abstract The identification of appropriate pigments for the conservation of cultural murals and sculptures continues to pose a significant challenge. In this paper, terahertz time-domain spectroscopy was utilized to distinguish the common heritage pigments. The terahertz time domain spectra, frequency domain spectra, transmission spectra, absorption spectra and refractive index of six pigments(garcinia, lapis, lazuli, loess, calcite, laterite, mineral green)with very different colors were analyzed and studied in the range 0.2 to 1.5THz. Furthermore, in order to demonstrate the applicability of terahertz time-domain spectroscopy more comprehensively, the terahertz spectra of garcinia and orpiment as well as laterite and sinopis with very similar colors were investigated and compared respectively. The experimental results show that indicate distinct differences in the spectral characteristics for each pigment. Additionally, evident differences in spectral characteristics were observed for pigments with the same main ingredients. These results suggest that terahertz measurement techniques can provide an accurate reference for restoring color to cultural relics.
Liu et al. (Mon,) studied this question.