I know ultraviolet CCD sensors exist and are probably expensive, specialty scientific equipment. I've kinda had this hope that one smartphone manufacturer (any of the big ones) would go to the trouble of including a UV camera and drive costs down. On the one hand you can market a unique and fun photography tool that lets you see the world in a different way. And then in the more serious part of the commercial, you show friends at the beach taking UV pictures of each other after applying sunscreen and one person says "You missed a spot right there, mate."
Plus I'd imagine you could immediately tell if your sunblock were BS and do an even better job of holding these folks accountable. You and buddy of similar skin tone both buy SPF 50 and apply it, take pictures, and see that one of you is not as well protected.
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