Fig. 7 | Heritage Science

Fig. 7

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. 7

MU-ATR spectra recorded on the specimens of (a) Echtgelb II ( signals related to * = PY1, ▼ = baryte, ■ = earth-base pigment) and (b) Indischgelb imit. II from Bössenroth in two different areas of the sample, showing the inhomogeneous distribution of the paint components (signals related to • = gypsum, * = PY1)

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