Abstract
The absorption spectra of seven red mineral pigments used in ancient Chinese artworks were measured by using terahertz time-domain spectroscopy (THz-TDS). Two absorption features of natural minerals HgS and four highly resolved spectral features of the mineral pigment Pb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> in the range of 0.2-3.0 THz (10.0-100.0 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> ) were observed and identified as their fingerprint spectra. In order to further demonstrate the applicability of THz-TDS, the THz spectra of different color regions on a fractional piece of the 19 th wall painting in Fuchen temple were investigated again and compared with the standard fingerprints of natural HgS pigments. Finally, the ZS pigment was successfully identified. This non-contact method can provide more color information for the analysis and restoration of cultural relics.
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