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Heritage Science
Fig. 5 | Heritage Science

Fig. 5

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. 5

SERS spectra: (a) synthetic alizarin-based lakes; (b) madder-based lakes; (c) Krapplack dunkel wash by Turm Wasserfarben Farben vs. Carminic Acid; (d) Karmin gebrannt wash by Flamuco Aquarell Farben vs. Alizarin, Purpurin and Carminic Acid; (e) Carmin fein 231 wash by Pelikan vs. Karmin n. 8 by Schoenfeld Wasserfarben; (f) Violett wash by Turm Wasserfarben vs. PV5

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