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1 Fretting corrosion is primarily a surface damage phenomenon occurring as a result of small cyclic movements between two materials caused by cyclic loading. Fretting damage can occur in vacuum, although it then would be better to speak of fretting, rather than fretting corrosion.
People with blond or red hair, light-colored eyes, and fair skin are especially susceptible to the damaging effect of UV rays. Freckling is caused by the uneven distribution of the melanin pigment in the skin. A freckle is essentially nothing more than an unusually heavy deposit of melanin at one spot in the skin.