Spectrum Vis-NIR reflectance spectrum of Roussillon pigment (PIG_0173_A_607), powder with grains < 50 µm Spectrum Vis-NIR reflectance spectrum of Roussillon pigment (PIG_0173_A_601), powder with grains < 160 µm Spectrum Vis-NIR reflectance spectrum of Roussillon pigment (PIG_0173_A_606), powder with grains 100-200 µm Spectrum Vis-NIR reflectance spectrum of Roussillon pigment (PIG_0173_A_602), powder with grains > 160 µm Spectrum Vis-NIR reflectance spectrum of Roussillon pigment (PIG_0173_A_604), powder with grains 200-400 µm Spectrum Vis-NIR reflectance spectrum of Roussillon pigment (PIG_0173_A_603), powder with grains > 400µm