Reactive Black WNN

Reactive Black WNN is a medium-temperature reactive dye developed for deep shades and high fastness on cellulose fibers. It is typically formulated using multi-component blending technology that combines highly reactive monochlorotriazine groups with more stable ethylene sulfone–based reactive groups. This hybrid design delivers a balanced black system characterized by high fixation efficiency, strong jet-black appearance, and reliable overall fastness.

In practical dyeing, Reactive Black WNN provides excellent depth and shade consistency. The resulting color ranges from neutral black to slightly bluish black, with strong covering power and good build-up. It effectively suppresses the natural yellow tone of cellulosic fibers, producing a clean, intense black. Thanks to its optimized molecular design, the proportion of hydrolyzed dye is relatively low, which improves wash-off efficiency, reduces after-treatment requirements, and supports cleaner and more economical processing. Standard performance tests show soap wash and perspiration fastness at 4–5 grades, dry rubbing fastness at 4–5 grades, wet rubbing fastness at 3–4 grades, and good lightfastness, meeting the demanding requirements of premium denim, workwear, and home textile applications.

The dye is suitable for a wide range of cellulose dyeing methods, including exhaust dyeing, pad dyeing, cold pad–batch dyeing, and continuous pad processes. Its good solubility and stable dye bath behavior ensure uniform penetration and high fixation in cold pad–batch systems, while its reactivity and shade stability support consistent results in continuous production. In addition, Reactive Black WNN can be easily combined with other reactive dyes, such as reds or blues, to fine-tune black undertones, allowing flexible shade adjustment to match different market preferences.