Fig. 1.

Morphological characteristics and scanning electron micrographs of the melanin obtained from I. hispidus. (A): Water-soluble IHFM: ①water-soluble melanin powder; ②5 mg of powder dissolved in 1 mL of water; ③–⑥ microstructure of melanin, which is surrounded by concentric layers of circular units. (B): Water-insoluble IHFM: ⑦water-insoluble melanin powder; ⑧The latter is insoluble in water, and there is a powder residue at the bottom of the centrifuge tube; ⑨–⑫microstructure of melanin, with an irregular arrangement.