Green river in Canada!!

Graigwen

Active member
Norbert Casteret once turned several kilometers of the Garonne green with fluorescein.

He was testing the hypothesis that water sinking at the Trou de Toro in Spain, which was about to be diverted for a Spanish water project, was the source of the River Garonne in France. He carried a huge amount of the dye on mules up into the Pyrenees.
 
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