Fig. 9From: 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 spectroscopySERS spectra: (a) Examples of methyl violet-based colours in Turm Wasserfarben and Siegle Ölfarben; (b) Neutral Tinte rötlich vs. Basic Violet 2Back to article page