Acid Black 2 is the formal Colour Index name for the classic azine dye, Nigrosine. It is renowned for its deep, jet-black colour and high solubility, making it an indispensable colourant in many industrial sectors. This dye provides a strong, pure black that is stable and easy to work with in aqueous formulations. Its primary use is in applications where a deep, soluble black is needed, such as inks, leather dyeing, and specialty stains, rather than high-fastness textiles.
