1958

Water sampling

on the Rhine near Düsseldorf
Black-and-white photograph of two men collecting a water sample from the river Rhine. One man is kneeling, holding a glass bottle, while the other bends down and fills the bottle using a wooden sampling stick.
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Taking a water sample from the river Rhine ‏(1960)

Henkel starts the systematic monitoring of the Rhine and its tributaries for detergent substances ‏(surfactants). It was a reaction to concerns about water pollution from detergent residues.