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Heritage Science
Fig. 2 | Heritage Science

Fig. 2

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

Fig. 2

Reflectance spectrum (left) and first derivative transformation (right) for each synthesized cochineal (a and b) and madder (c and d) pigment. Typical literature values for absorption minima are marked to highlight shifts. Relevant inflection points for characterization have also been highlighted. For simplicity, all data presented are of pigments painted in gum Arabic

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