Aniline black is a term that refers to a dye that is commonly used in textiles and leather. The dye is derived from aniline, which is a colorless liquid. Aniline black is also known as nigrosine, solvent black 5, or oil black. Similar dyes include acid black 1 and basic black 1. Nigrosine is the most common synonym for aniline black, which is a water-soluble black dye that is used to color a variety of materials. It is popularly used in dyeing cotton, silk, wool and leather. The dye gives a dark black color to the material, making it more appealing and fashionable.