Carbon black is one of the most commonly used coloring additives in synthetic fibers. It imparts long-lasting high tinting strength and deep black color together with a bluish undertone to textile, industrial and non-woven products that can withstand a variety of damaging external agents. The requirements for carbon black for use in fibers can vary depending upon the type of polymer (PET, PA, PP, cellulose, PAN, etc.), the method of incorporation into the polymer (during polymerization or downstream during fiber spinning); the spinning technology used (melt or solution spinning) and if the carbon black is incorporated either as a liquid dispersion or a thermoplastic concentrate. The carbon black selection can also depend upon the fineness of the fibers and their intended end usage.