Reactive Red 21 is a monoazo dye featuring a vinyl sulfone (VS) reactive system. It produces a neutral to slightly yellowish-red shade and is a highly economical and versatile choice for dyeing cellulosic fibres. The VS reactive group allows for flexible application across a range of temperatures and methods, from cold-pad-batch to high-temperature exhaust dyeing, providing a reliable and efficient dyeing performance for general-purpose textile colouration.
