how do they make the chicago river green
Chicago River The United States Environmental Protection Agency (EPA) outlawed the use of fluorescein for this purpose, since it was shown to be harmful to the river.[73] The parade committee has since switched to a mix involving forty pounds of powdered vegetable dye.[75] Though the committee closely guards the exact formula, they insist that it has been tested and verified safe for the environment.[76] Furthermore, since the environmental organization Friends of the Chicago River believes the dye is probably not harmful, they do not oppose the practice.[77]
Great Lakes Waterway The waterway allows passage from the Atlantic Ocean to the inland port of Duluth on Lake Superior, a distance of 2,340 miles (3,770 km) and to Chicago, on Lake Michigan, at 2,250 miles (3,620 km).[1]