Forel-Ule scale

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The Forel-Ule scale is a measuring method with which the color of a body of water can be determined; it is used in applied limnology . With the help of different inorganic salts, a color palette is created in water tubes and compared with the color of the water. The result is a color index for the water.

It was originally developed by François-Alphonse Forel . Three years later, the German limnologist Willi Ule refined this procedure. This scale is hardly used today because it is very imprecise and depends on the observer and his or her subjective color perception. It was later replaced by the so-called platinum-cobalt scale , which is less subjective.

Web links

  • MR Wernand, HJ van der Woerd (2010) Spectral analysis of the Forel-Ule Ocean color comparator scale. Journal of the European Optical Society - Rapid publications, 10014s, Vol. 5 , doi : 10.2971 / jeos.2010.10014s