Aug 16, 2013
Crude oil is not always black as is often depicted in movies. Petroleum is another name for crude oil, which is unprocessed oil. The outputs of processing crude oil are called petrochemicals. The color varies greatly from clear to black, and and in viscosity, from water to almost solid, based on the concentration of hydrocarbon molecules and other compounds in the mixture. For instance, Pennsylvania grade crude oil is typically greenish in color.