Sweet & Sour, Heavy & Light
Blog :Figuring Things Out
Date: 6/12/2012 11:05:00 AM
One has heard of tea-tasters but it is hard to believe that at one time, there were also professional crude-oil tasters.
In the 19th century workers in the fledgeling oil industry used their sense of taste and smell to classify petroleum into four categories - sweet, sour, heavy and light. These days the same classification is used to determine the cost of the petrol or diesel that goes into