to turn it this green.
Sponsored by the Plumbers Union, each year forty pounds of vegetable dye is poured into a section of the Chicago River to get this lovely shade of electric green for St. Patrick's Day. (They originally started with 100 pounds, but the river stayed green for a week.)
The dye actually starts out orange, and changes color once the powder hits the water.
The dye was originally used to detect leaks into the river.
Kinda makes for a nice backdrop, doncha think?
For more info, check out the Green Chicago River site.
Happy St. Patrick's Day everyone.