Solvent dyes refer to colored substances that are insoluble in water but soluble in organic solvents. It is a kind of dye, which is insoluble in water but can be dissolved in grease or organic lotion. Solvent dyes can be divided into two categories: oil-soluble and alcohol-soluble.
Solvent dyes are mainly used for the coloring of wood and plastics, but also for the coloring of transparent paints, inks, fats, oils, waxes, soaps, petroleum products, and aerosols: aluminum foil, leather, etc. It can also be used for the coloring of raw pulp of synthetic fibers.