Black SP Liquid is a commercial name for a high-concentration liquid direct black dye, typically a synergistic blend of several polyazo dyes. It is engineered to provide a deep, neutral to slightly reddish-black shade with excellent colour value. The “SP” designation often refers to its suitability for paper applications. As a ready-to-use liquid, it eliminates dusting issues and is ideal for automated, continuous dyeing systems in paper mills.
