Fig. 4

Comparison of the FORS spectra of azurite (Kremer 1673112) (red) with measurement points on folio 1r (black), 37r (yellow) and 47v (blue) shows differing reflectance maxima in the blue spectral region

Comparison of the FORS spectra of azurite (Kremer 1673112) (red) with measurement points on folio 1r (black), 37r (yellow) and 47v (blue) shows differing reflectance maxima in the blue spectral region