Melanin has ions which are like batteries. https://chemistry.stackexchange.com/questions/54097/difference-between-black-and-brown-eumelanin-red-and-pink-pheomelanin https://www.pnas.org/content/pnas/109/23/8943.full.pdf https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4497562/
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