The history of Dyeing the Chicago River Green


If you visit Chicago during St. Patrick’s Day, you will undoubtedly witness one of the strangest traditions in the country: the river dyeing. For five decades, Chicago has put on a shade of bright emerald green that matches that of the people celebrating, by dumping 40 pounds of environmentally friendly dye right into the Chicago River.
References are as below:

Dyeing the Chicago River green is a St. Patrick’s Day tradition. How did it start? https://www.npr.org/2022/03/16/1086988193/st-patricks-day-green-chicago-river
How Do They Dye the Chicago River Green for St. Patrick’s Day? https://www.mentalfloss.com/article/62220/what-do-they-use-dye-chicago-river-green-st-patricks-day
Is the Chicago River Dye Eco-Friendly? Behind the St. Paddy’s Day Tradition https://www.greenmatters.com/p/what-is-chicago-river-dyed-with
Chicago River To Be Dyed Green Again, And Parades Are Back For St. Patrick’s Day Weekend https://blockclubchicago.org/2022/03/08/chicago-river-dyed-green-st-patricks-day-parade-time-south-side-parade-time/
Why Do We Wear Green on St. Patrick’s Day? https://www.rd.com/article/wear-green-st-patricks-day/