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Heritage Science
Fig. 6 | Heritage Science

Fig. 6

From: Seeing red: towards an improved protocol for the identification of madder- and cochineal-based pigments by fiber optics reflectance spectroscopy (FORS)

Fig. 6

First derivative (left) and apparent absorbance spectrum (right) of a a pink area on lap of figure on Henri de Toulouse-Lautrec’s Model Resting (1889, oil on cardboard, The J. Paul Getty Museum, 84.PC.39) (red curve) compared against a standard madder lake (M-Std) in linseed oil (black curve); and b a pink/red flower on the bonnet of Édouard Manet’s Jeanne (1881, oil on canvas, The J. Paul Getty Museum, 2014.62) (red curve) compared against a tin cochineal carmine made in the laboratory (black curve). Sampled areas are marked with a white cross

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