Figure 4. UV-Vis spectra of sepia melanin. The UV-Vis wavelength scan showed the absorption was highest at the UV region of 200 to 300 nm, but diminished towards the visible region

From

Natural Dye Sensitizer for Grӓtzel Cells: Sepia Melanin

Agnes Mbonyiryivuze, Isaiah Omollo, Balla Diop Ngom, Bonex Mwakikunga, Simon Mokhotjwa Dhlamini, Eugene Park, Malik Maaza

Physics and Materials Chemistry. 2015, 3(1), 1-6 doi:10.12691/pmc-3-1-1