Light of wavelength below the visible range. Wavelength for maximal germicidal action is 260 nm; it has poor penetrating power and is of value only for surface sterilization or sterilizing air and water. Also used for tenderizing and ageing of meat, curing cheese, and prevention of mould growth on the surface of bakery products.
Ultraviolet from sunlight is responsible for skin tanning, and the formation of vitamin D from 7‐dehydrocholesterol in the skin.
Subjects: Medicine and Health.