13 links have been added on 6 ideas about #beach.
  1. Great idea but just found this. “The main rock in South East England’s coastline is chalk. Chalk cannot be broken down into sand. The pebbles on Brighton’s Beach are mainly composed of flint. (Yes, the kind of flint that you can strike to make a fire). Flint’s a very useful substance in developing societies even if it doesn’t erode well into sand.” Oh well…

  2. 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.

  3. 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.