GERMANY | Friday, 15 September 2017 | Views [224]
Blautopf (German for Blue Pot) is a spring in the city of Blaubeuren and a drain for the Blau cave system. The waters blue color is a result of physical properties of the nanoscale limestone densely distributed in the water. The particles are so small that the so called Rayleigh scattering of light takes place scattering the blue color in the visible light. Similar effect is observed in the Blue Lagoon in Reykjavik, Iceland.