Fig. 7From: 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 spectroscopyMU-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)Back to article page