Reactive Brown 18 is a monoazo dye based on a vinyl sulfone (VS) reactive system. It is a high-performance dye valued for its yellowish-brown shade and excellent fixation properties. The versatile VS group allows for application across a wide range of temperatures and methods, from cold-pad-batch to high-temperature exhaust dyeing. It is a reliable and highly efficient choice for achieving durable brown shades on all types of cellulosic fibres.