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Heritage Science
Fig. 4 | Heritage Science

Fig. 4

From: Analytical studies on commercial artists’ colour charts from Das Deutsche Farbenbuch (1925)—identification of synthetic and natural organic colourants by Raman microscopy, surface-enhanced Raman spectroscopy and metal underlayer ATR-FTIR spectroscopy

Fig. 4

Spectra obtained for the Paynes grau hue, Turm watercolours: (a) Raman spectrum of the reference indigo compared with the spectrum obtained with the specimen; (b) SERS spectrum of the reference methyl violet compared with the spectrum obtained with the specimen

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