Fig. 6From: 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 spectroscopyNormal Raman spectra: (a) Moderot 3, Siegle Ölfarben vs. Pigment Red 1; (b) Echtrot deckend, Neisch Tempera Farben vs. Pigment Red 3; (c) Echtrot PR, Siegle Ölfarben vs. Pigment Red 4; (d) Dunkelbordeaux 30, Siegle Ölfarben vs. Pigment Red 40; (e) Corallenrot 5, Siegle Ölfarben vs. Pigment Red 49:1; (f) Carmoisin BL, Siegle Ölfarben vs. Pigment Red 54; (g) Karminlack, Turm Wasserfarben vs. Pigment Red 57:1Back to article page