White gas is a common name for two flammable substances. In its most common modern usage, it is used as a generic name for camp stove and lantern fuel, usually naphtha

Naphtha

Naphtha normally refers to a number of different flammable liquid mixtures of hydrocarbons, i.e., a component of natural gas condensate or a distillation product from petroleum, coal tar or peat boiling in a certain range and containing certain hydrocarbons. It is a broad term covering among the...

.

White gasoline, also called white gas, can also be a name for pure gasoline

Gasoline

Gasoline , or petrol , is a toxic, translucent, petroleum-derived liquid that is primarily used as a fuel in internal combustion engines. It consists mostly of organic compounds obtained by the fractional distillation of petroleum, enhanced with a variety of additives. Some gasolines also contain...

, without additives. This was commonly used when leaded gasoline was the norm, to prevent fouling in situations where the properties of the tetraethyl lead additive were not required.

Fuel dyes

Fuel dyes

Fuel dyes are dyes added to fuels, as in some countries it is required by law to dye a low-tax fuel to deter its use in applications intended for higher-taxed ones...

, "White" gas is colorless, as opposed to "regular" octane

Octane rating

Octane rating or octane number is a standard measure of the anti-knock properties of a motor or aviation fuel. The higher the octane number, the more compression the fuel can withstand before detonating...

fuel, which has orange dye added for identification, or high-octane "ethyl", which has purple dye added.