89 octane fuel color

after i rode tonight, i went to go fill up at the local exxon station, i always fill up with the 89 octane fuel. when my tank was all filled up, i glanced into the tank and noticed the fuel was not clear like usual, instead it had a bluish/greenish tint. Is it me, or are they doing something to our fuel supply? or is it something in my tank taht's causing this color?

kinda has that coolant looking glow to it.