Fig. 1. Formation and characterization of melanin pigment with homogenous size distribution (A) TEM image with ×12 000 magnification, (B) size distribution, where y axis is the contribution of scattered light intensity from particles with different sizes to total light intensity, (C) UV-Vis spectrum in the range of 280–800 nm, and (D) FTIR spectrum in the range of 4000–650 cm⁻¹.