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The viability of fiber optics reflectance spectroscopy (FORS) for the differentiation of red chalk drawing media was investigated, focusing on the group of drawings from the workshop of Giovanni Battista Piranesi (1720–1778) at the Staatliche Kunsthalle Karlsruhe, Germany. The evaluation of spectra was supported by principal component analysis. The method was tested on mockup drawings made with recently acquired natural and fabricated red chalks of known origin. It was possible to sort thesedoi:10.21203/rs.3.rs-580566/v1 fatcat:hyhjhgpw7rf65ii4zty3no7bza