Chicago River Turns Green for Irish Holiday

St Patrick’s Day may fall on a Tuesday this year, but Chicagoans celebrated on Saturday, turning the Chicago River green for the occasion. The coloring process took five hours and involved a mix of forty pounds of powdered green vegetable dye being tipped overboard a boat. Thousands attend the riverside event each year, a tradition that dates back to 1962. This time-lapse video captures the process. Credit: YouTube/Peter Tsai