Why Chicago dyes its river green for St. Patrick's Day
CNN
Read on to learn more about the tradition of dyeing the Chicago River and the dye so secret only a select few know the recipe.
This year's celebrations were a welcome return to form for Chicago, which canceled previous St. Patrick's Day parades due to the pandemic. Read on to learn more about the tradition, its union roots and the dye so secret only a select few know the recipe.
The tradition was started by plumbers
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