The Chicago River is still green after being dyed Saturday in the annual Plumbers Local 130 UA ceremony. Thousands of people lined the river walk to watch the river get turned green. Other cities have attempted to copy the same formula the plumbers union has used to dye the Chicago River green since 1962, but the union has kept its secret closely guarded. When the tradition first started, the river stayed green for an entire week. Now, it typically goes back to normal within 48 hours.
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