RUNGACTIVE HE dyes are suitable for dyeing cotton and other cellulosic materials. These dyes possess significantly higher exhaustion and fixation efficiency which results in appreciable cost reduction in comparison to conventional reactive dyes. The high fixation and good build up are of particular importance when dyeing polyester/cellulosic blends where liquor to goods ratio is quite high. Due to higher fixation of Rungactive HE dyes, the drained and wash liquor after dyeing contain much less quantity of unifixed dyes, in comparison to conventional reactive dyes, which is of interest when pollution control is major concern to everybody. This facilitates quicker wash off and efficient soaping. The improved stability of Rungactive HE dyes gives improved batch to batch consistancy. Exhaustion of Rungactive HE dyes can be controlled by salt addition and temperature to give level dyeing before alkali addition.