Aviation gasoline is dyed, both for tax reasons (avgas is typically taxed to support aviation infrastructure) as well as safety (due to the consequences of fueling an aircraft with the wrong kind of fuel).
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In the United Kingdom, "red diesel" is dyed gas oil for registered agricultural or construction vehicles such as tractors, excavators, cranes and some other non-road applications such as boats.
"White" gas is colorless, as opposed to "regular" octane fuel, which has orange dye added for identification, or high-octane "ethyl", which has purple dye added.
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