Dye
Sometimes dyes are added to fuel for identification. However there are different systems in use and this has led to confusion. In the United States one color scheme dyed one kind of aircraft fuel red while in another color scheme red dye was used for indicating untaxed agricultural diesel. The UK uses Red Dye to differentiate between regular diesel fuel, (often referred to as DERV), which is undyed, and diesel intended for Agricultural and construction vehicles (Excavators, Bulldozers). Red Diesel is still occasionally used on HGV's which use a separate engine to power a loader crane. This is a declining practice however, as many loader cranes are powered directly by the tractor unit.
http://en.wikipedia.org/wiki/Gasoline
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