Almost every fuel terminal or ethanol plant I go to, I can easily pick out which tank is storing the ethanol. Over only about a year, they start to look like this picture below. The black residue also attaches to other metal object near by. It's chalky and doesn't come off easily. It almost has a carbon feel to it. I've asked terminal personal but they have no clue.
So what is this residue? Why only on the ethanol tanks?
(Pic from Google Street view)
So what is this residue? Why only on the ethanol tanks?
(Pic from Google Street view)