Fig. 3From: 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 spectroscopy10 (of the 11) colour charts of different German brands of watercolour, tempera, and oil paints being part of Das Deutsche Farbenbuch, Part II (1925)Back to article page