<P> 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 . The parade committee has since switched to a mix involving forty pounds of powdered vegetable dye . Though the committee closely guards the exact formula , they insist that it has been tested and verified safe for the environment . Furthermore , since the environmental organization Friends of the Chicago River believes the dye is probably not harmful , they do not oppose the practice . </P>
<P> 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 . The parade committee has since switched to a mix involving forty pounds of powdered vegetable dye . Though the committee closely guards the exact formula , they insist that it has been tested and verified safe for the environment . Furthermore , since the environmental organization Friends of the Chicago River believes the dye is probably not harmful , they do not oppose the practice . </P>
how much dye does it take to dye the chicago river
how much dye does it take to dye the chicago river
forty pounds of powdered vegetable dye
forty pounds of powdered vegetable dye