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Fig. 3 | Heritage Science

Fig. 3

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

Fig. 3

FORS data obtained on the (a) blue, (b) green, (c) dark green and (d) outline areas of the three prints by Hokusai; and (e–h) various blues and (i, j) various greens of the print by Kunishada. The large absorption band in the NIR (700–950 nm) suggests Prussian blue, the inflection point at 468 nm in (b), (c), and 490 nm in (i) and (j) suggests the presence of arsenic sulfide and the large 400–700 nm absorption in band in (c) and (d) suggests indigo. Inflexion point at 468 and 490 nm (arsenic sulfide) and at 707 nm (indigo) are further highlighted by plots (b′), (c′) (d′) and (i′), first derivatives of respective (b), (c), (d) and (i) curves

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