Fig. 4 | Heritage Science

Fig. 4

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

Fig. 4

FORS spectra of the three main types of cochineal based pigments: tin carmine (C-Sn), aluminum carmines (DYE15046 and C-Al) and cochineal lake (C-Std M). Spectra have been normalized using offset correction (maximum reflectance set to 1.0) and values for the absorption peaks for the tin cochineal carmine (which match typical literature values for cochineal pigments) are marked for comparison

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