Fig. 4From: Azurite in medieval illuminated manuscripts: a reflection-FTIR study concerning the characterization of binding mediaThe rFTIR spectra of azurite 14 µm with glair (red line) or Arabic gum (black line) show additional spectral features compared to azurite without binder (blue line). The δ O–H out of plane bending and the ν3 CO32− bands are much stronger if a binder is addedBack to article page