Reactive Blue 221 is a high-performance, bifunctional reactive dye that produces a brilliant, clear, greenish-blue shade. It is often a metal-complex dye based on an azo or formazan chromophore, engineered for high fixation and excellent brightness. Its brilliant shade and very good all-around fastness properties make it a popular choice for achieving vibrant, durable turquoise and bright blue colours on all types of cellulosic fibres.
