Someone i knew used 10 old military sea dye markers one time to turn 35 miles of a stream in northern Calif fluorescent green.
www.prestodye.com...
Fluorescein dye is harmless but will bring out every government agency to investigate.so you don't want to stick around to gloat at you work.
One of its more recognizable uses was in the Chicago River, where fluorescein was the used to dye the river green on St. Patrick's Day.
www.ctvbc.ctv.ca...
www.molallapioneer.com...
news.inthekoots.com...
blogs.eugeneweekly.com...
www.terradaily.com...
Around the US environmental groups put this dye into water just to get the government to test it for pollution.
www.bloggingcanadians.ca...
PETA has used it to disrupt opening day of fishing season on rivers and lakes around the US.
as soon a the water turns green the government closes it to fishing till its tested and that sometimes takes days.
I always want to use it on a water fall in Calif.