Every year
About 30... For more information go to /http:/wikipedia.com/ChicagoRiver
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.
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.
Forty pounds of powdered vegetable dye are usedto create a carpet of green a couple of blocks long that lasts four to five hoursfor the St.Patrick's Day celebration
The largest parade and most celebrations are in New York city. Chicago also has a big parade plus they paint the center stripe of the parade route green and dye the Chicago River green. There are large celebrations all over the city that has a very large Irish population.
its organic dye
Green dye is made by combining blue dye and yellow dye, which can both be made from Aggie, the dye maker in Draynor village.