Fig. 8From: Identification of pigments used in a Qajar manuscript from Iran by using atomic and molecular spectroscopy and technical photography methodsRaman spectra of the blue pigment of manuscript and indigo, collected with 785 nm laser excitation, showing high structural similarity. The presence of a peak of about 1090 cm−1 is related to the vibrations of calcite as one of the pigments in the blue mixtureBack to article page