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An old gadget that’s gaining renewed attention these days thanks to the spread of Covid-19 is ultraviolet lightboxes for sanitising personal and household items such as mobile phones, earbuds and even toys.
Without going too deep into the science, UV light is known to have an effect on bacteria and viruses.
UV-C in particular, which is ultraviolet light with a wavelength between 100 and 280 nanometers, is germicidal (i.e., it disrupts germ DNA to kill them or make them ineffective) and is usually what these household UV light-blasting phone/toy/underwear disinfection boxes use. Of these boxes (and there are a lot on Taobao), US-based PhoneSoap is arguably the most famous.
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