ว้าวน้ำสีฟ้าสวยๆ 📍🇩🇪 / Blautopf /blue pot / Blaubeuren
Blautopf/blue pot
The blue pot in Blaubeuren in Baden-Württemberg is the second-richest karst spring in Germany. This is where the blue springs, which after about 22 kilometers in the city of Ulm flows into the Danube.
Known is the blue pot for the depending on the light more or less intense, but always strikingly blue color of its water. The blue color is caused by a physical effect of light scattering (so-called Rayleigh scattering) on the nanoscale lime particles that are dispersed in the water. Due to their small size, the blue light is preferably scattered and produces the blue glow. The same effect can be observed with the Blue Lagoon in Iceland; There, the effect is caused by nanoscale silicate particles.