Solvent Red 23, widely known as Sudan III, is a classic oil-soluble disazo dye. It produces a strong, yellowish-red color and is primarily used for coloring hydrocarbon-based substances. Its excellent solubility in fats and oils has made it a traditional choice for a wide variety of industrial applications, from coloring waxes and candles to its use as a biological stain for identifying lipids in laboratory analysis.