Cov xim dub ultra violet iav khov yog cov pa ceev nruj.

Rau cov khw muag tshuaj qhuav (qee qhov muaj zog ntxhiab) thiab lawv ua kom zoo dua yog tias koj tsis kam qhib lub rhawv zeb. Nco ntsoov sau koj cov rhawv zeb raws li tsis muaj ntxhiab yog ntes tau thiab tsis muaj dab tsi yog pom nyob rau hauv qhov ze opaque indigo xim.