Melanin absorbs light very effectively and can dissipate the majority of the UV radiation. The UV radiation can be harmful, so it is a protective reaction of our skin. Scientifically speaking, melanogenesis triggered by exposure to UV radiation. In human skin, the most readily observable change is tan: skin darkening after a day in the sun. At an even later age, even black one can fade away, leaving hair with no color (it appears white because of the optical effects). As the body ages, it stops producing brown eumelanin but continues producing the black eumelanin hence the hair turns grey. Our hair itself is more or less transparent, and it is melanins that give it color. You have seen the effects of the changes in melanin in human bodies many times! For example, eumelanin in the reason we get gray hair with aging. Eumelanin is both the most common and the most abundant, and typically is the one "missing" in cases of albinism. Those that impact our external appearance the most are brown eumelanin, black eumelanin, and yellow and red pigment pheomelanin. Melanin group includes several pigments, each "responsible" for their color. We also have melanin in our eyes, but we will get to it soon. Melanin is a name for a group of pigments found in most organisms, including us, humans! Melanin is what makes our skin and hair appear darker or take a specific shade. Why Do People Have Different Eye Colors? Human eye close-up.
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