15 links have been added on 5 ideas about #sunbathing.
  1. They are a good idea, but diluted sunscreen brands can be very deadly.
    https://www.theguardian.com/australia-news/2020/dec/17/cancer-council-warns-against-using-aerosol-sunscreens

  2. These UV detection stickers are a must-have when going to the beach or when spending outdoors on sunny days.
    https://www.today.com/health/l-or-al-unveils-my-uv-patch-skin-sensor-which-t65771

  3. Not transparent, but fishermen already use these – want one!

  4. this almost exists already.

  5. Wow, I think you can get these now, https://www.cnet.com/roadshow/news/bosch-virtual-car-sun-visor-ces-2020/

  6. it would have to be made of a fabric with a band pass filter that blocks all wavelengths EXCEPT UV. Not impossible, but not a thing yet. As far as I know. Could be dangerous though, folks will be getting blasted by UV all day long without realising it. So there’s your cancer versus vanity gamble.

  7. Is a material like this possible? ” A lot of materials will not allow visible light through but will allow UV through, as UV is more powerful, just as X-rays can get through your muscles to your bones but visible light can not as easily.” – but no examples given.