Mystery of why Venice’s Grand Canal turned fluorescent green is solved

Local authorities say transformation was due to fluorescein, a substance used to test wastewater networks

The spectacular transformation of a stretch of Venice’s Grand Canal to fluorescent green was due to fluorescein, a non-toxic substance used for testing wastewater networks, local authorities have concluded

Residents noticed a stretch of Venice’s Grand Canal turned bright green on Sunday, prompting police to investigate amid speculation it could be a stunt by environmentalists.