Crude Oil

Color / Form

Crude oil is not a uniform substance since its physical and chemical properties vary from oilfield to oilfield and can even vary within wells at the same oilfield. At one extreme, crude oil is a light, mobile, straw-colored liquid containing a large proportion of hydrocarbons which are readily distilled at atmospheric pressure. At the other extreme, crude oil is a highly viscous, semi-solid, black substance from which little can be distilled at atmospheric pressure before thermal decomposition occurs.
Find more information on this substance at: Hazardous Substances Data Bank , TOXNET , PubMed