Fig. 2From: 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 spectroscopyChapter on potential coal-tar colourants for artists’ purposes, Das Deutsche Farbenbuch, Part II (1925), p. 38fBack to article page