The Cologne Bridge Green

Cologne lies by the Rhine river, so we need bridges. They are all beautiful and green – chromium oxide green, more precisely, which, in fact, is known as Cologne green. Lord Mayor Konrad Adenauer wanted a patina-like green color and in 1929 Bayer AG mixed the color, which is particularly light and weather resistant.

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Image: The particular green of Severin Bridge in Cologne. Copyright: Dietmar Rabich.

http://manchesterhistory.net/architecture/1940/severin.html

https://en.wikipedia.org/wiki/Chromium(III)_oxide

https://www.guiding-architects.net/architecture-tour/cologne/