A solvent dye is a special kind of dye that gets soluble in the organic solvents. It is generally used as a solution for use in organic solvents. Typical applications include for colouring of a variety of items. Popular among them are for colouring of organic solvents, plastics, waxes, hydrocarbon fuels, lubricants, and a host of other non polar hydrocarbon based materials. Fuel dyes is one of the most popular uses of solvent dyes.