@CNN: The Chicago River turns green for St. Patrick’s Day. This time-lapse video shows the handiwork of the Chicago Plumbers Union Local 130, who’ve been dying the river for 55 years. The dye typically lasts for 24 to 48 hours. https://t.co/022VnNmLvy Video: Lindsey Engelbert https://t.co/J01pRbp6AB

@CNN: The Chicago River turns green for St. Patrick’s Day. This time-lapse video shows the handiwork of the Chicago Plumbers Union Local 130, who’ve been dying the river for 55 years. The dye typically lasts for 24 to 48 hours. https://t.co/022VnNmLvy Video: Lindsey Engelbert https://t.co/J01pRbp6AB