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Fig. 4 | Heritage Science

Fig. 4

From: Evidence of early amorphous arsenic sulfide production and use in Edo period Japanese woodblock prints by Hokusai and Kunisada

Fig. 4

Raman spectra of (a) the blue areas, (b) the green areas, (c) the dark blue areas and (d) the blue outline of the words in the cartouche in print A, B and C; and (e) dark blue, (f) the light blue, and (g) the green in print D. Unless orpiment was foreseen, only the 1550–2600 cm−1 region of the Raman spectra was measured as characteristic contributions for both indigo and Prussian blue are found in this region. In Raman spectroscopy, the contributions observed between 100 and 600 cm−1 correspond to natural arsenic sulfide in prints by Hokusai (A–C) and to artificial arsenic sulfide in the print by Kunisada (D); the one at 1573 indicates indigo and the pair of contributions between 2095 and 2155 cm−1 correspond to Prussian blue

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