Solvent Black 5, widely known as Nigrosine, is a classic azine dye valued for its intense, jet-black color. It is highly soluble in polar organic solvents like alcohols and ketones, making it a top choice for formulating lacquers, inks, and stains. It is also used to color thermosetting plastics like Bakelite and for providing a deep black in wax-based products like shoe polish. Its high tinctorial strength makes it a very economical black.