The water along a stretch of the famed Grand Canal in Venice mysteriously turned bright green on Sunday, prompting Venetian authorities to launch an investigation into what happened, reported CNN.

The water along a stretch of the famed Grand Canal in Venice mysteriously turned bright green on Sunday, prompting Venetian authorities to launch an investigation into what happened, reported CNN.

A bright patch of green is seen in the Grand Canal along an embankment lined with restaurants, in Venice, Italy, Sunday, May 28, 2023. (AP Photo/Luigi Costantini) ...

This is not the first time Venice’s Grand Canal has changed color. In 1968 Argentine artist Nicolás García Uriburu dyed the waters of the canal green with a fluorescent dye called Fluorescein ...

A section of Venice, Italy's Grand Canal near the Rialto Bridge, seen at center, was mysteriously turned bright green, May 28, 2023. Italian police and firefighters were investigating the cause.

A patch of water in Venice’s famed Grand Canal has turned fluorescent green, stumping residents and tourists and prompting an investigation involving police, the regional environmental agency ...

A version of this article appears in print on May 31, 2023, Section A, Page 5 of the New York edition with the headline: Venice Learns What Turned Grand Canal Green.

During the annual 1968 Venice Biennale, Argentine artist Nicolás García Uriburu transformed the canal waters green with Fluorescein, according to the Metropolitan Museum of Art (MET).