can have different color and viscocity. you can see the viscocity, first you look at different colors. there's a thinness to thickness. what i am goto i am going to rotate this wheel. we should be able to capture the flow which indicates the viscocity. what makes a difference, when oil is priced, you say the spot price of oil is $90 or $100, it is based on what they call intermediate or west texas intermediate, a nice grade of oil. oil as it is sold is sold different prices based upon the number of characteristics, one viscocity, other sulphur or other impurities. one of the things about getting oil from canada, sands, it is thick embedded in loose sand rather than rock and it is thicker oil and it is tougher to produce and refine. you can have very light oils, which would have less impurities in them, and really an indication all oil is made of carbon and hydrogen, and all different compounds are in this oil. as you refine oil, what we are basically doing is separating the hydrocarbons and different compounds out of the oi