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by exo-cortex 1224 days ago
Hm.... I've spent a lot of waiting time in this station (Rosenthaler Platz) over the years. And these tiles (in different colors though) are in a considerable amount of Berlin subway stations. Are they all radioactive like these here? Or is it only caused by the orange pigment?
1 comments

The orange pigment was made with uranium.
Specifically, Uranium Oxide (UO2, I guess? Or maybe the trioxide?):

https://blog.colornavigator.net/dangerous-colors

https://en.wikipedia.org/wiki/Uranium_trioxide