Spectrum Vis BRDF of pure silicon dioxide (SiO2, 0.5 - 10 µm) Spectrum Vis BRDF of a binary mixture of silicon dioxide and Juniper charcoal (10 wt.%) Spectrum Vis BRDF of a binary mixture of silicon dioxide and Juniper charcoal (20 wt.%) Spectrum Vis BRDF of a binary mixture of silicon dioxide and Juniper charcoal (30 wt.%) Spectrum Vis BRDF of a binary mixture of silicon dioxide and Juniper charcoal (40 wt.%) Spectrum Vis BRDF of a binary mixture of silicon dioxide and Juniper charcoal (50 wt.%) Spectrum Vis BRDF of a binary mixture of silicon dioxide and Juniper charcoal (60 wt.%) Spectrum Vis BRDF of a binary mixture of silicon dioxide and Juniper charcoal (70 wt.%) Spectrum Vis BRDF of a binary mixture of silicon dioxide and Juniper charcoal (80 wt.%) Spectrum Vis BRDF of a binary mixture of silicon dioxide and Juniper charcoal (90 wt.%) Spectrum Vis BRDF of pure juniper charcoal (less than 50 µm)