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2 In a 1979 study by Kaidbey et al using cadaveric skin, the mean protective factor from Ultraviolet (UV) B radiation in black skin was found to be 13.4 compared to 3.4 for white skin and the mean rate of UVB transmission into the dermis was 5.7% in black skin compared to 29.4% in white skin.

The increased melanin content and widely dispersed melanosomes in darker skin provide photoprotection. Darkly pigmented skin is characterized by larger, more numerous melanosomes that contain more melanin and are more singly dispersed throughout the epidermis compared to lightly pigmented skin.