The natural oil is full of chemicals and that is why it is reddish brown. Also the color of natural oil can change depending on where you are drilling for it. For example it may be strait black in some places, and reddish brown in others.
I was working in Oklahoma and west Texas. I was at three different oil spills while working on the oil derricks. Oil spills are common on land where they drill but it is easier to clean up there as well.
I also worked 22 miles offshore of Grand Isle Louisiana in the Gulf of Mexico, where this blowout is going on now. I know this area well and this place is full of fish of all kinds. I saw 5 and 6 foot long sharks everyday. We threw our food scraps from meals overboard to the sharks, they eat everything, tin cans as well. I was young and dumb then.
Both of my hands were burned by the crude oil, and I got some on my face but I got it off before it harmed me to bad. It did burn my hands where I was off work for about 6 or 8 weeks for the burns to heal.
I did not scar and I recovered from it OK.
I am not in touch with the others there. I don't know the effects of their afterlife from the oil went. I was exposed to the crude for about 8 hours.
I think I got a settlement of 16,000 dollars for the injuries to my hands. They paid me off of course to stay quite about it.
A side note of Humor here, on Grand Isle they sell hats that have a picture of a large hairy mosquito on the front of it and underneath it says, "Louisiana state bird", the mosquito is real viscous looking....LOL