"In the human skin, melanogenesis is initiated by exposure to UV radiation, causing the skin to darken. Melanin is an effective absorbent of light; the pigment

"In the human skin, melanogenesis is initiated by exposure to UV radiation, causing the skin to darken. Melanin is an effective absorbent of light; the pigment is able to dissipate over 99.9% of absorbed UV radiation." https://en.wikipedia.org/wiki/Melanin https://en.wikipedia.org/wiki/Melanin "Radiative relaxation quantum yields for synthetic eumelanin" https://pubmed.ncbi.nlm.nih.gov/15068035/ https://pubmed.ncbi.nlm.nih.gov/15068035/