LEDμSF: A new portable device for fragile artworks analyses. Application on medieval pigments

The analyses have defined the characteristic bands of the fluorescence emission of some red, blue, and yellow pigments (e.g. the red lead gives maximum fluorescence at 580 nm; cinnabar at 610 nm, bucktooth around 530 nm...). The characteristic maxima emission wavelengths allow us to discriminate most of the pigments mixed with different binders, deposited on quartz plates, on parchment or on illuminated facsimile.