Forty pounds of powdered vegetable dye are used
to create a carpet of green a couple of blocks long that lasts four to five hours
for the St.Patrick's Day celebration
Every year
It's actually blue dye that turns the Chicago River green.
Dye is poured from the back of a motor boat which helps mix the dye in the river water.
The river.
They dye the Chicago River green on St. Patrick's Day in Chicago.
Forty gallons of green vegetable dye are used to color the Chicago river for the St. Patrick's day celebration.
About 30... For more information go to /http:/wikipedia.com/ChicagoRiver
The Chicago River and San Antonio River are dyed green every St. Patrick's Day.
Chicago river (green river Chicago) gets dyed green every year.
Chicago
40 pounds are currently put in the chigago river on St.patricks day. It last for several hours now. it used to last for a week.
The city dyes the Chicago River green.